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Finding the Fourth Proportional to 642,778.68, 887,041.98 and 356,303.64

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Solution

The fourth proportional to 642,778.68, 887,041.98 and 356,303.64 is: 491,703.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,778.68 : 887,041.98 = 356,303.64 : x
  2. Step 2: Convert to fraction form
    642,778.68/887,041.98 = 356,303.64/x
  3. Step 3: Cross multiply
    642,778.68x = 887,041.98 × 356,303.64
  4. Step 4: Simplify right side
    642,778.68x = 316,056,286,306.81
  5. Step 5: Solve for x
    x = 316,056,286,306.81/642,778.68
  6. Step 6: Final answer
    x = 491,703.13

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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.