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Finding the Fourth Proportional to 87,210.60, 130,815.90 and 42,865.80

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Solution

The fourth proportional to 87,210.60, 130,815.90 and 42,865.80 is: 64,298.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,210.60 : 130,815.90 = 42,865.80 : x
  2. Step 2: Convert to fraction form
    87,210.60/130,815.90 = 42,865.80/x
  3. Step 3: Cross multiply
    87,210.60x = 130,815.90 × 42,865.80
  4. Step 4: Simplify right side
    87,210.60x = 5,607,528,206.22
  5. Step 5: Solve for x
    x = 5,607,528,206.22/87,210.60
  6. Step 6: Final answer
    x = 64,298.70

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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.