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Finding the Fourth Proportional to 612,905.70, 919,358.55 and 423,948.90

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Solution

The fourth proportional to 612,905.70, 919,358.55 and 423,948.90 is: 635,923.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,905.70 : 919,358.55 = 423,948.90 : x
  2. Step 2: Convert to fraction form
    612,905.70/919,358.55 = 423,948.90/x
  3. Step 3: Cross multiply
    612,905.70x = 919,358.55 × 423,948.90
  4. Step 4: Simplify right side
    612,905.70x = 389,761,045,978.10
  5. Step 5: Solve for x
    x = 389,761,045,978.10/612,905.70
  6. Step 6: Final answer
    x = 635,923.35

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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.