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Finding the Fourth Proportional to 15,706.66, 21,654.12 and 13,458.82

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Solution

The fourth proportional to 15,706.66, 21,654.12 and 13,458.82 is: 18,555.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,706.66 : 21,654.12 = 13,458.82 : x
  2. Step 2: Convert to fraction form
    15,706.66/21,654.12 = 13,458.82/x
  3. Step 3: Cross multiply
    15,706.66x = 21,654.12 × 13,458.82
  4. Step 4: Simplify right side
    15,706.66x = 291,438,903.34
  5. Step 5: Solve for x
    x = 291,438,903.34/15,706.66
  6. Step 6: Final answer
    x = 18,555.12

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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.