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Finding the Fourth Proportional to 142,655.40, 213,983.10 and 87,359.40

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Solution

The fourth proportional to 142,655.40, 213,983.10 and 87,359.40 is: 131,039.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,655.40 : 213,983.10 = 87,359.40 : x
  2. Step 2: Convert to fraction form
    142,655.40/213,983.10 = 87,359.40/x
  3. Step 3: Cross multiply
    142,655.40x = 213,983.10 × 87,359.40
  4. Step 4: Simplify right side
    142,655.40x = 18,693,435,226.14
  5. Step 5: Solve for x
    x = 18,693,435,226.14/142,655.40
  6. Step 6: Final answer
    x = 131,039.10

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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.