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Finding the Fourth Proportional to 8,700.17, 13,021.09 and 7,140.11

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Solution

The fourth proportional to 8,700.17, 13,021.09 and 7,140.11 is: 10,686.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,700.17 : 13,021.09 = 7,140.11 : x
  2. Step 2: Convert to fraction form
    8,700.17/13,021.09 = 7,140.11/x
  3. Step 3: Cross multiply
    8,700.17x = 13,021.09 × 7,140.11
  4. Step 4: Simplify right side
    8,700.17x = 92,971,931.96
  5. Step 5: Solve for x
    x = 92,971,931.96/8,700.17
  6. Step 6: Final answer
    x = 10,686.23

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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.