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Finding the Fourth Proportional to 145,364.40, 217,900.80 and 66,535.20

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Solution

The fourth proportional to 145,364.40, 217,900.80 and 66,535.20 is: 99,736.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,364.40 : 217,900.80 = 66,535.20 : x
  2. Step 2: Convert to fraction form
    145,364.40/217,900.80 = 66,535.20/x
  3. Step 3: Cross multiply
    145,364.40x = 217,900.80 × 66,535.20
  4. Step 4: Simplify right side
    145,364.40x = 14,498,073,308.16
  5. Step 5: Solve for x
    x = 14,498,073,308.16/145,364.40
  6. Step 6: Final answer
    x = 99,736.07

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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.