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Finding the Fourth Proportional to 21,988.95, 30,342.95 and 12,429.66

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Solution

The fourth proportional to 21,988.95, 30,342.95 and 12,429.66 is: 17,151.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,988.95 : 30,342.95 = 12,429.66 : x
  2. Step 2: Convert to fraction form
    21,988.95/30,342.95 = 12,429.66/x
  3. Step 3: Cross multiply
    21,988.95x = 30,342.95 × 12,429.66
  4. Step 4: Simplify right side
    21,988.95x = 377,152,489.75
  5. Step 5: Solve for x
    x = 377,152,489.75/21,988.95
  6. Step 6: Final answer
    x = 17,151.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.