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Finding the Fourth Proportional to 642,462.16, 886,620.84 and 387,763.60

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Solution

The fourth proportional to 642,462.16, 886,620.84 and 387,763.60 is: 535,127.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,462.16 : 886,620.84 = 387,763.60 : x
  2. Step 2: Convert to fraction form
    642,462.16/886,620.84 = 387,763.60/x
  3. Step 3: Cross multiply
    642,462.16x = 886,620.84 × 387,763.60
  4. Step 4: Simplify right side
    642,462.16x = 343,799,288,753.42
  5. Step 5: Solve for x
    x = 343,799,288,753.42/642,462.16
  6. Step 6: Final answer
    x = 535,127.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.