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Finding the Fourth Proportional to 21,064, 31,432.60 and 18,264.64

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Solution

The fourth proportional to 21,064, 31,432.60 and 18,264.64 is: 27,255.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,064 : 31,432.60 = 18,264.64 : x
  2. Step 2: Convert to fraction form
    21,064/31,432.60 = 18,264.64/x
  3. Step 3: Cross multiply
    21,064x = 31,432.60 × 18,264.64
  4. Step 4: Simplify right side
    21,064x = 574,105,123.26
  5. Step 5: Solve for x
    x = 574,105,123.26/21,064
  6. Step 6: Final answer
    x = 27,255.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.