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Finding the Fourth Proportional to 12,390.80, 18,543.02 and 10,143.68

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Solution

The fourth proportional to 12,390.80, 18,543.02 and 10,143.68 is: 15,180.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390.80 : 18,543.02 = 10,143.68 : x
  2. Step 2: Convert to fraction form
    12,390.80/18,543.02 = 10,143.68/x
  3. Step 3: Cross multiply
    12,390.80x = 18,543.02 × 10,143.68
  4. Step 4: Simplify right side
    12,390.80x = 188,094,461.11
  5. Step 5: Solve for x
    x = 188,094,461.11/12,390.80
  6. Step 6: Final answer
    x = 15,180.17

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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.