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Finding the Fourth Proportional to 18,985.92, 28,478.88 and 12,104.16

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Solution

The fourth proportional to 18,985.92, 28,478.88 and 12,104.16 is: 18,156.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,985.92 : 28,478.88 = 12,104.16 : x
  2. Step 2: Convert to fraction form
    18,985.92/28,478.88 = 12,104.16/x
  3. Step 3: Cross multiply
    18,985.92x = 28,478.88 × 12,104.16
  4. Step 4: Simplify right side
    18,985.92x = 344,712,920.14
  5. Step 5: Solve for x
    x = 344,712,920.14/18,985.92
  6. Step 6: Final answer
    x = 18,156.24

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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.