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Finding the Fourth Proportional to 15,689.81, 21,652.10 and 8,616.39

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Solution

The fourth proportional to 15,689.81, 21,652.10 and 8,616.39 is: 11,890.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,689.81 : 21,652.10 = 8,616.39 : x
  2. Step 2: Convert to fraction form
    15,689.81/21,652.10 = 8,616.39/x
  3. Step 3: Cross multiply
    15,689.81x = 21,652.10 × 8,616.39
  4. Step 4: Simplify right side
    15,689.81x = 186,562,845.95
  5. Step 5: Solve for x
    x = 186,562,845.95/15,689.81
  6. Step 6: Final answer
    x = 11,890.70

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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.