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Finding the Fourth Proportional to 124,538.40, 171,811 and 81,528.40

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Solution

The fourth proportional to 124,538.40, 171,811 and 81,528.40 is: 112,475.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,538.40 : 171,811 = 81,528.40 : x
  2. Step 2: Convert to fraction form
    124,538.40/171,811 = 81,528.40/x
  3. Step 3: Cross multiply
    124,538.40x = 171,811 × 81,528.40
  4. Step 4: Simplify right side
    124,538.40x = 14,007,475,932.40
  5. Step 5: Solve for x
    x = 14,007,475,932.40/124,538.40
  6. Step 6: Final answer
    x = 112,475.16

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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.