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Finding the Fourth Proportional to 87,205.60, 130,808.40 and 42,860.80

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Solution

The fourth proportional to 87,205.60, 130,808.40 and 42,860.80 is: 64,291.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,205.60 : 130,808.40 = 42,860.80 : x
  2. Step 2: Convert to fraction form
    87,205.60/130,808.40 = 42,860.80/x
  3. Step 3: Cross multiply
    87,205.60x = 130,808.40 × 42,860.80
  4. Step 4: Simplify right side
    87,205.60x = 5,606,552,670.72
  5. Step 5: Solve for x
    x = 5,606,552,670.72/87,205.60
  6. Step 6: Final answer
    x = 64,291.20

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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.