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Finding the Fourth Proportional to 898,312.80, 1,347,469.20 and 425,920.80

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Solution

The fourth proportional to 898,312.80, 1,347,469.20 and 425,920.80 is: 638,881.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    898,312.80 : 1,347,469.20 = 425,920.80 : x
  2. Step 2: Convert to fraction form
    898,312.80/1,347,469.20 = 425,920.80/x
  3. Step 3: Cross multiply
    898,312.80x = 1,347,469.20 × 425,920.80
  4. Step 4: Simplify right side
    898,312.80x = 573,915,159,639.36
  5. Step 5: Solve for x
    x = 573,915,159,639.36/898,312.80
  6. Step 6: Final answer
    x = 638,881.20

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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.