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Finding the Fourth Proportional to 91,602, 137,422.60 and 28,420.76

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Solution

The fourth proportional to 91,602, 137,422.60 and 28,420.76 is: 42,637.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,602 : 137,422.60 = 28,420.76 : x
  2. Step 2: Convert to fraction form
    91,602/137,422.60 = 28,420.76/x
  3. Step 3: Cross multiply
    91,602x = 137,422.60 × 28,420.76
  4. Step 4: Simplify right side
    91,602x = 3,905,654,733.18
  5. Step 5: Solve for x
    x = 3,905,654,733.18/91,602
  6. Step 6: Final answer
    x = 42,637.22

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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.