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Finding the Fourth Proportional to 72,612.84, 100,200.78 and 40,781.04

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Solution

The fourth proportional to 72,612.84, 100,200.78 and 40,781.04 is: 56,275.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,612.84 : 100,200.78 = 40,781.04 : x
  2. Step 2: Convert to fraction form
    72,612.84/100,200.78 = 40,781.04/x
  3. Step 3: Cross multiply
    72,612.84x = 100,200.78 × 40,781.04
  4. Step 4: Simplify right side
    72,612.84x = 4,086,292,017.21
  5. Step 5: Solve for x
    x = 4,086,292,017.21/72,612.84
  6. Step 6: Final answer
    x = 56,275.06

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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.