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Finding the Fourth Proportional to 28,117.80, 42,128.10 and 13,294.80

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Solution

The fourth proportional to 28,117.80, 42,128.10 and 13,294.80 is: 19,919.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,117.80 : 42,128.10 = 13,294.80 : x
  2. Step 2: Convert to fraction form
    28,117.80/42,128.10 = 13,294.80/x
  3. Step 3: Cross multiply
    28,117.80x = 42,128.10 × 13,294.80
  4. Step 4: Simplify right side
    28,117.80x = 560,084,663.88
  5. Step 5: Solve for x
    x = 560,084,663.88/28,117.80
  6. Step 6: Final answer
    x = 19,919.22

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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.