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Finding the Fourth Proportional to 8,700.72, 12,988.11 and 7,649.80

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Solution

The fourth proportional to 8,700.72, 12,988.11 and 7,649.80 is: 11,419.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,700.72 : 12,988.11 = 7,649.80 : x
  2. Step 2: Convert to fraction form
    8,700.72/12,988.11 = 7,649.80/x
  3. Step 3: Cross multiply
    8,700.72x = 12,988.11 × 7,649.80
  4. Step 4: Simplify right side
    8,700.72x = 99,356,443.88
  5. Step 5: Solve for x
    x = 99,356,443.88/8,700.72
  6. Step 6: Final answer
    x = 11,419.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.