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Finding the Fourth Proportional to 87,312.80, 130,988.40 and 28,138.40

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Solution

The fourth proportional to 87,312.80, 130,988.40 and 28,138.40 is: 42,213.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,312.80 : 130,988.40 = 28,138.40 : x
  2. Step 2: Convert to fraction form
    87,312.80/130,988.40 = 28,138.40/x
  3. Step 3: Cross multiply
    87,312.80x = 130,988.40 × 28,138.40
  4. Step 4: Simplify right side
    87,312.80x = 3,685,803,994.56
  5. Step 5: Solve for x
    x = 3,685,803,994.56/87,312.80
  6. Step 6: Final answer
    x = 42,213.79

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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.