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Finding the Fourth Proportional to 21,658.95, 29,889.45 and 12,706.47

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Solution

The fourth proportional to 21,658.95, 29,889.45 and 12,706.47 is: 17,534.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,658.95 : 29,889.45 = 12,706.47 : x
  2. Step 2: Convert to fraction form
    21,658.95/29,889.45 = 12,706.47/x
  3. Step 3: Cross multiply
    21,658.95x = 29,889.45 × 12,706.47
  4. Step 4: Simplify right side
    21,658.95x = 379,789,399.74
  5. Step 5: Solve for x
    x = 379,789,399.74/21,658.95
  6. Step 6: Final answer
    x = 17,534.99

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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.