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Finding the Fourth Proportional to 29,403.80, 40,630.74 and 21,432.20

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Solution

The fourth proportional to 29,403.80, 40,630.74 and 21,432.20 is: 29,615.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,403.80 : 40,630.74 = 21,432.20 : x
  2. Step 2: Convert to fraction form
    29,403.80/40,630.74 = 21,432.20/x
  3. Step 3: Cross multiply
    29,403.80x = 40,630.74 × 21,432.20
  4. Step 4: Simplify right side
    29,403.80x = 870,806,145.83
  5. Step 5: Solve for x
    x = 870,806,145.83/29,403.80
  6. Step 6: Final answer
    x = 29,615.43

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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.