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Finding the Fourth Proportional to 90,042.30, 134,869.05 and 74,490.30

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Solution

The fourth proportional to 90,042.30, 134,869.05 and 74,490.30 is: 111,574.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,042.30 : 134,869.05 = 74,490.30 : x
  2. Step 2: Convert to fraction form
    90,042.30/134,869.05 = 74,490.30/x
  3. Step 3: Cross multiply
    90,042.30x = 134,869.05 × 74,490.30
  4. Step 4: Simplify right side
    90,042.30x = 10,046,435,995.22
  5. Step 5: Solve for x
    x = 10,046,435,995.22/90,042.30
  6. Step 6: Final answer
    x = 111,574.63

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1.5x scale

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.