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Finding the Fourth Proportional to 8,689.68, 13,005.36 and 5,391.36

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Solution

The fourth proportional to 8,689.68, 13,005.36 and 5,391.36 is: 8,068.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,689.68 : 13,005.36 = 5,391.36 : x
  2. Step 2: Convert to fraction form
    8,689.68/13,005.36 = 5,391.36/x
  3. Step 3: Cross multiply
    8,689.68x = 13,005.36 × 5,391.36
  4. Step 4: Simplify right side
    8,689.68x = 70,116,577.69
  5. Step 5: Solve for x
    x = 70,116,577.69/8,689.68
  6. Step 6: Final answer
    x = 8,068.95

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1.5x scale

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.