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Finding the Fourth Proportional to 18,438.76, 27,658.40 and 4,587.76

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Solution

The fourth proportional to 18,438.76, 27,658.40 and 4,587.76 is: 6,881.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,438.76 : 27,658.40 = 4,587.76 : x
  2. Step 2: Convert to fraction form
    18,438.76/27,658.40 = 4,587.76/x
  3. Step 3: Cross multiply
    18,438.76x = 27,658.40 × 4,587.76
  4. Step 4: Simplify right side
    18,438.76x = 126,890,101.18
  5. Step 5: Solve for x
    x = 126,890,101.18/18,438.76
  6. Step 6: Final answer
    x = 6,881.70

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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.