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Finding the Fourth Proportional to 16,389.95, 22,616.92 and 9,315

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Solution

The fourth proportional to 16,389.95, 22,616.92 and 9,315 is: 12,854.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,389.95 : 22,616.92 = 9,315 : x
  2. Step 2: Convert to fraction form
    16,389.95/22,616.92 = 9,315/x
  3. Step 3: Cross multiply
    16,389.95x = 22,616.92 × 9,315
  4. Step 4: Simplify right side
    16,389.95x = 210,676,621.44
  5. Step 5: Solve for x
    x = 210,676,621.44/16,389.95
  6. Step 6: Final answer
    x = 12,854.02

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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.