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Finding the Fourth Proportional to 21,073.76, 29,081.80 and 11,513.72

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Solution

The fourth proportional to 21,073.76, 29,081.80 and 11,513.72 is: 15,888.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,073.76 : 29,081.80 = 11,513.72 : x
  2. Step 2: Convert to fraction form
    21,073.76/29,081.80 = 11,513.72/x
  3. Step 3: Cross multiply
    21,073.76x = 29,081.80 × 11,513.72
  4. Step 4: Simplify right side
    21,073.76x = 334,839,702.30
  5. Step 5: Solve for x
    x = 334,839,702.30/21,073.76
  6. Step 6: Final answer
    x = 15,888.94

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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.