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Finding the Fourth Proportional to 87,007.80, 130,511.70 and 42,721.05

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Solution

The fourth proportional to 87,007.80, 130,511.70 and 42,721.05 is: 64,081.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,007.80 : 130,511.70 = 42,721.05 : x
  2. Step 2: Convert to fraction form
    87,007.80/130,511.70 = 42,721.05/x
  3. Step 3: Cross multiply
    87,007.80x = 130,511.70 × 42,721.05
  4. Step 4: Simplify right side
    87,007.80x = 5,575,596,861.29
  5. Step 5: Solve for x
    x = 5,575,596,861.29/87,007.80
  6. Step 6: Final answer
    x = 64,081.58

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1.5x scale

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.