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Finding the Fourth Proportional to 30,948.59, 42,728.90 and 21,274.14

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Solution

The fourth proportional to 30,948.59, 42,728.90 and 21,274.14 is: 29,371.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,948.59 : 42,728.90 = 21,274.14 : x
  2. Step 2: Convert to fraction form
    30,948.59/42,728.90 = 21,274.14/x
  3. Step 3: Cross multiply
    30,948.59x = 42,728.90 × 21,274.14
  4. Step 4: Simplify right side
    30,948.59x = 909,020,593.53
  5. Step 5: Solve for x
    x = 909,020,593.53/30,948.59
  6. Step 6: Final answer
    x = 29,371.95

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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.