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Finding the Fourth Proportional to 612,139.40, 918,209.10 and 425,515.40

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Solution

The fourth proportional to 612,139.40, 918,209.10 and 425,515.40 is: 638,273.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,139.40 : 918,209.10 = 425,515.40 : x
  2. Step 2: Convert to fraction form
    612,139.40/918,209.10 = 425,515.40/x
  3. Step 3: Cross multiply
    612,139.40x = 918,209.10 × 425,515.40
  4. Step 4: Simplify right side
    612,139.40x = 390,712,112,470.14
  5. Step 5: Solve for x
    x = 390,712,112,470.14/612,139.40
  6. Step 6: Final answer
    x = 638,273.10

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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.