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Finding the Fourth Proportional to 8,700.57, 12,009.65 and 5,115.36

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Solution

The fourth proportional to 8,700.57, 12,009.65 and 5,115.36 is: 7,060.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,700.57 : 12,009.65 = 5,115.36 : x
  2. Step 2: Convert to fraction form
    8,700.57/12,009.65 = 5,115.36/x
  3. Step 3: Cross multiply
    8,700.57x = 12,009.65 × 5,115.36
  4. Step 4: Simplify right side
    8,700.57x = 61,433,629.59
  5. Step 5: Solve for x
    x = 61,433,629.59/8,700.57
  6. Step 6: Final answer
    x = 7,060.87

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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.