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Finding the Fourth Proportional to 642,646.20, 886,851.86 and 356,184.78

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Solution

The fourth proportional to 642,646.20, 886,851.86 and 356,184.78 is: 491,535.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,646.20 : 886,851.86 = 356,184.78 : x
  2. Step 2: Convert to fraction form
    642,646.20/886,851.86 = 356,184.78/x
  3. Step 3: Cross multiply
    642,646.20x = 886,851.86 × 356,184.78
  4. Step 4: Simplify right side
    642,646.20x = 315,883,132,865.77
  5. Step 5: Solve for x
    x = 315,883,132,865.77/642,646.20
  6. Step 6: Final answer
    x = 491,535.05

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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.