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Finding the Fourth Proportional to 874,676.70, 1,312,015.05 and 313,638.30

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Solution

The fourth proportional to 874,676.70, 1,312,015.05 and 313,638.30 is: 470,457.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    874,676.70 : 1,312,015.05 = 313,638.30 : x
  2. Step 2: Convert to fraction form
    874,676.70/1,312,015.05 = 313,638.30/x
  3. Step 3: Cross multiply
    874,676.70x = 1,312,015.05 × 313,638.30
  4. Step 4: Simplify right side
    874,676.70x = 411,498,169,856.42
  5. Step 5: Solve for x
    x = 411,498,169,856.42/874,676.70
  6. Step 6: Final answer
    x = 470,457.45

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.