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Finding the Fourth Proportional to 30,374.76, 45,531.90 and 21,121.32

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Solution

The fourth proportional to 30,374.76, 45,531.90 and 21,121.32 is: 31,660.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,374.76 : 45,531.90 = 21,121.32 : x
  2. Step 2: Convert to fraction form
    30,374.76/45,531.90 = 21,121.32/x
  3. Step 3: Cross multiply
    30,374.76x = 45,531.90 × 21,121.32
  4. Step 4: Simplify right side
    30,374.76x = 961,693,830.11
  5. Step 5: Solve for x
    x = 961,693,830.11/30,374.76
  6. Step 6: Final answer
    x = 31,660.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.