Home / 66,691.28-91,990.52-42,780.08

Finding the Fourth Proportional to 66,691.28, 91,990.52 and 42,780.08

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Solution

The fourth proportional to 66,691.28, 91,990.52 and 42,780.08 is: 59,008.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,691.28 : 91,990.52 = 42,780.08 : x
  2. Step 2: Convert to fraction form
    66,691.28/91,990.52 = 42,780.08/x
  3. Step 3: Cross multiply
    66,691.28x = 91,990.52 × 42,780.08
  4. Step 4: Simplify right side
    66,691.28x = 3,935,361,804.84
  5. Step 5: Solve for x
    x = 3,935,361,804.84/66,691.28
  6. Step 6: Final answer
    x = 59,008.64

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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.