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Finding the Fourth Proportional to 8,700.47, 12,987.69 and 7,649.54

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Solution

The fourth proportional to 8,700.47, 12,987.69 and 7,649.54 is: 11,418.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,700.47 : 12,987.69 = 7,649.54 : x
  2. Step 2: Convert to fraction form
    8,700.47/12,987.69 = 7,649.54/x
  3. Step 3: Cross multiply
    8,700.47x = 12,987.69 × 7,649.54
  4. Step 4: Simplify right side
    8,700.47x = 99,349,789.22
  5. Step 5: Solve for x
    x = 99,349,789.22/8,700.47
  6. Step 6: Final answer
    x = 11,418.91

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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.