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Finding the Fourth Proportional to 91,569.63, 137,359.64 and 28,398.74

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Solution

The fourth proportional to 91,569.63, 137,359.64 and 28,398.74 is: 42,599.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,569.63 : 137,359.64 = 28,398.74 : x
  2. Step 2: Convert to fraction form
    91,569.63/137,359.64 = 28,398.74/x
  3. Step 3: Cross multiply
    91,569.63x = 137,359.64 × 28,398.74
  4. Step 4: Simplify right side
    91,569.63x = 3,900,840,087.05
  5. Step 5: Solve for x
    x = 3,900,840,087.05/91,569.63
  6. Step 6: Final answer
    x = 42,599.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.