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Finding the Fourth Proportional to 83,390.66, 115,068.56 and 66,437.90

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Solution

The fourth proportional to 83,390.66, 115,068.56 and 66,437.90 is: 91,675.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,390.66 : 115,068.56 = 66,437.90 : x
  2. Step 2: Convert to fraction form
    83,390.66/115,068.56 = 66,437.90/x
  3. Step 3: Cross multiply
    83,390.66x = 115,068.56 × 66,437.90
  4. Step 4: Simplify right side
    83,390.66x = 7,644,913,482.42
  5. Step 5: Solve for x
    x = 7,644,913,482.42/83,390.66
  6. Step 6: Final answer
    x = 91,675.90

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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.