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Finding the Fourth Proportional to 90,420.70, 135,501.45 and 66,541.90

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Solution

The fourth proportional to 90,420.70, 135,501.45 and 66,541.90 is: 99,717.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,420.70 : 135,501.45 = 66,541.90 : x
  2. Step 2: Convert to fraction form
    90,420.70/135,501.45 = 66,541.90/x
  3. Step 3: Cross multiply
    90,420.70x = 135,501.45 × 66,541.90
  4. Step 4: Simplify right side
    90,420.70x = 9,016,523,935.76
  5. Step 5: Solve for x
    x = 9,016,523,935.76/90,420.70
  6. Step 6: Final answer
    x = 99,717.48

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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.