Home / 31,148.28-42,990.75-21,711.51

Finding the Fourth Proportional to 31,148.28, 42,990.75 and 21,711.51

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Solution

The fourth proportional to 31,148.28, 42,990.75 and 21,711.51 is: 29,966.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,148.28 : 42,990.75 = 21,711.51 : x
  2. Step 2: Convert to fraction form
    31,148.28/42,990.75 = 21,711.51/x
  3. Step 3: Cross multiply
    31,148.28x = 42,990.75 × 21,711.51
  4. Step 4: Simplify right side
    31,148.28x = 933,394,098.53
  5. Step 5: Solve for x
    x = 933,394,098.53/31,148.28
  6. Step 6: Final answer
    x = 29,966.15

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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.