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Finding the Fourth Proportional to 642,506.40, 963,759.60 and 405,079.20

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Solution

The fourth proportional to 642,506.40, 963,759.60 and 405,079.20 is: 607,618.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,506.40 : 963,759.60 = 405,079.20 : x
  2. Step 2: Convert to fraction form
    642,506.40/963,759.60 = 405,079.20/x
  3. Step 3: Cross multiply
    642,506.40x = 963,759.60 × 405,079.20
  4. Step 4: Simplify right side
    642,506.40x = 390,398,967,760.32
  5. Step 5: Solve for x
    x = 390,398,967,760.32/642,506.40
  6. Step 6: Final answer
    x = 607,618.80

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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.