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Finding the Fourth Proportional to 18,885.40, 28,328.10 and 9,043.90

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Solution

The fourth proportional to 18,885.40, 28,328.10 and 9,043.90 is: 13,565.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,885.40 : 28,328.10 = 9,043.90 : x
  2. Step 2: Convert to fraction form
    18,885.40/28,328.10 = 9,043.90/x
  3. Step 3: Cross multiply
    18,885.40x = 28,328.10 × 9,043.90
  4. Step 4: Simplify right side
    18,885.40x = 256,196,503.59
  5. Step 5: Solve for x
    x = 256,196,503.59/18,885.40
  6. Step 6: Final answer
    x = 13,565.85

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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.