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Finding the Fourth Proportional to 642,645.70, 886,851.15 and 356,184.28

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Solution

The fourth proportional to 642,645.70, 886,851.15 and 356,184.28 is: 491,534.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,645.70 : 886,851.15 = 356,184.28 : x
  2. Step 2: Convert to fraction form
    642,645.70/886,851.15 = 356,184.28/x
  3. Step 3: Cross multiply
    642,645.70x = 886,851.15 × 356,184.28
  4. Step 4: Simplify right side
    642,645.70x = 315,882,438,329.92
  5. Step 5: Solve for x
    x = 315,882,438,329.92/642,645.70
  6. Step 6: Final answer
    x = 491,534.35

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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.