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Finding the Fourth Proportional to 38,380.70, 52,956.15 and 21,613.70

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Solution

The fourth proportional to 38,380.70, 52,956.15 and 21,613.70 is: 29,821.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,380.70 : 52,956.15 = 21,613.70 : x
  2. Step 2: Convert to fraction form
    38,380.70/52,956.15 = 21,613.70/x
  3. Step 3: Cross multiply
    38,380.70x = 52,956.15 × 21,613.70
  4. Step 4: Simplify right side
    38,380.70x = 1,144,578,339.26
  5. Step 5: Solve for x
    x = 1,144,578,339.26/38,380.70
  6. Step 6: Final answer
    x = 29,821.72

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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.