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Finding the Fourth Proportional to 8,700.67, 13,021.84 and 7,140.61

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Solution

The fourth proportional to 8,700.67, 13,021.84 and 7,140.61 is: 10,686.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,700.67 : 13,021.84 = 7,140.61 : x
  2. Step 2: Convert to fraction form
    8,700.67/13,021.84 = 7,140.61/x
  3. Step 3: Cross multiply
    8,700.67x = 13,021.84 × 7,140.61
  4. Step 4: Simplify right side
    8,700.67x = 92,983,780.11
  5. Step 5: Solve for x
    x = 92,983,780.11/8,700.67
  6. Step 6: Final answer
    x = 10,686.97

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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.