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Finding the Fourth Proportional to 8,700.59, 11,987.11 and 8,285.87

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Solution

The fourth proportional to 8,700.59, 11,987.11 and 8,285.87 is: 11,415.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,700.59 : 11,987.11 = 8,285.87 : x
  2. Step 2: Convert to fraction form
    8,700.59/11,987.11 = 8,285.87/x
  3. Step 3: Cross multiply
    8,700.59x = 11,987.11 × 8,285.87
  4. Step 4: Simplify right side
    8,700.59x = 99,323,635.14
  5. Step 5: Solve for x
    x = 99,323,635.14/8,700.59
  6. Step 6: Final answer
    x = 11,415.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.