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Finding the Fourth Proportional to 18,689.66, 27,913.35 and 16,931.15

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Solution

The fourth proportional to 18,689.66, 27,913.35 and 16,931.15 is: 25,286.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,689.66 : 27,913.35 = 16,931.15 : x
  2. Step 2: Convert to fraction form
    18,689.66/27,913.35 = 16,931.15/x
  3. Step 3: Cross multiply
    18,689.66x = 27,913.35 × 16,931.15
  4. Step 4: Simplify right side
    18,689.66x = 472,604,976.29
  5. Step 5: Solve for x
    x = 472,604,976.29/18,689.66
  6. Step 6: Final answer
    x = 25,286.98

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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.