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Finding the Fourth Proportional to 8,707.52, 12,018.84 and 7,139.36

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Solution

The fourth proportional to 8,707.52, 12,018.84 and 7,139.36 is: 9,854.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,707.52 : 12,018.84 = 7,139.36 : x
  2. Step 2: Convert to fraction form
    8,707.52/12,018.84 = 7,139.36/x
  3. Step 3: Cross multiply
    8,707.52x = 12,018.84 × 7,139.36
  4. Step 4: Simplify right side
    8,707.52x = 85,806,825.54
  5. Step 5: Solve for x
    x = 85,806,825.54/8,707.52
  6. Step 6: Final answer
    x = 9,854.34

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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.