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Finding the Fourth Proportional to 28,478.17, 42,699.03 and 13,686.76

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Solution

The fourth proportional to 28,478.17, 42,699.03 and 13,686.76 is: 20,521.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,478.17 : 42,699.03 = 13,686.76 : x
  2. Step 2: Convert to fraction form
    28,478.17/42,699.03 = 13,686.76/x
  3. Step 3: Cross multiply
    28,478.17x = 42,699.03 × 13,686.76
  4. Step 4: Simplify right side
    28,478.17x = 584,411,375.84
  5. Step 5: Solve for x
    x = 584,411,375.84/28,478.17
  6. Step 6: Final answer
    x = 20,521.38

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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.