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Finding the Fourth Proportional to 642,419.20, 963,191.40 and 243,000.10

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Solution

The fourth proportional to 642,419.20, 963,191.40 and 243,000.10 is: 364,334.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,419.20 : 963,191.40 = 243,000.10 : x
  2. Step 2: Convert to fraction form
    642,419.20/963,191.40 = 243,000.10/x
  3. Step 3: Cross multiply
    642,419.20x = 963,191.40 × 243,000.10
  4. Step 4: Simplify right side
    642,419.20x = 234,055,606,519.14
  5. Step 5: Solve for x
    x = 234,055,606,519.14/642,419.20
  6. Step 6: Final answer
    x = 364,334.70

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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.