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Finding the Fourth Proportional to 35,390.81, 48,862.08 and 21,981.47

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Solution

The fourth proportional to 35,390.81, 48,862.08 and 21,981.47 is: 30,348.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    35,390.81 : 48,862.08 = 21,981.47 : x
  2. Step 2: Convert to fraction form
    35,390.81/48,862.08 = 21,981.47/x
  3. Step 3: Cross multiply
    35,390.81x = 48,862.08 × 21,981.47
  4. Step 4: Simplify right side
    35,390.81x = 1,074,060,101.35
  5. Step 5: Solve for x
    x = 1,074,060,101.35/35,390.81
  6. Step 6: Final answer
    x = 30,348.56

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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.