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Finding the Fourth Proportional to 38,691.88, 53,395.40 and 21,699.90

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Solution

The fourth proportional to 38,691.88, 53,395.40 and 21,699.90 is: 29,946.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,691.88 : 53,395.40 = 21,699.90 : x
  2. Step 2: Convert to fraction form
    38,691.88/53,395.40 = 21,699.90/x
  3. Step 3: Cross multiply
    38,691.88x = 53,395.40 × 21,699.90
  4. Step 4: Simplify right side
    38,691.88x = 1,158,674,894.71
  5. Step 5: Solve for x
    x = 1,158,674,894.71/38,691.88
  6. Step 6: Final answer
    x = 29,946.20

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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.