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Finding the Fourth Proportional to 642,817.86, 887,081.67 and 370,882.50

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Solution

The fourth proportional to 642,817.86, 887,081.67 and 370,882.50 is: 511,813.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,817.86 : 887,081.67 = 370,882.50 : x
  2. Step 2: Convert to fraction form
    642,817.86/887,081.67 = 370,882.50/x
  3. Step 3: Cross multiply
    642,817.86x = 887,081.67 × 370,882.50
  4. Step 4: Simplify right side
    642,817.86x = 329,003,067,473.78
  5. Step 5: Solve for x
    x = 329,003,067,473.78/642,817.86
  6. Step 6: Final answer
    x = 511,813.82

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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.