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Finding the Fourth Proportional to 91,602.64, 137,423.54 and 28,421.38

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Solution

The fourth proportional to 91,602.64, 137,423.54 and 28,421.38 is: 42,638.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,602.64 : 137,423.54 = 28,421.38 : x
  2. Step 2: Convert to fraction form
    91,602.64/137,423.54 = 28,421.38/x
  3. Step 3: Cross multiply
    91,602.64x = 137,423.54 × 28,421.38
  4. Step 4: Simplify right side
    91,602.64x = 3,905,766,651.29
  5. Step 5: Solve for x
    x = 3,905,766,651.29/91,602.64
  6. Step 6: Final answer
    x = 42,638.15

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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.