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Finding the Fourth Proportional to 111,489.16, 153,815.32 and 66,132.40

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Solution

The fourth proportional to 111,489.16, 153,815.32 and 66,132.40 is: 91,239.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,489.16 : 153,815.32 = 66,132.40 : x
  2. Step 2: Convert to fraction form
    111,489.16/153,815.32 = 66,132.40/x
  3. Step 3: Cross multiply
    111,489.16x = 153,815.32 × 66,132.40
  4. Step 4: Simplify right side
    111,489.16x = 10,172,176,268.37
  5. Step 5: Solve for x
    x = 10,172,176,268.37/111,489.16
  6. Step 6: Final answer
    x = 91,239.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.