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Finding the Fourth Proportional to 72,705.60, 100,339.56 and 40,872.60

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Solution

The fourth proportional to 72,705.60, 100,339.56 and 40,872.60 is: 56,407.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,705.60 : 100,339.56 = 40,872.60 : x
  2. Step 2: Convert to fraction form
    72,705.60/100,339.56 = 40,872.60/x
  3. Step 3: Cross multiply
    72,705.60x = 100,339.56 × 40,872.60
  4. Step 4: Simplify right side
    72,705.60x = 4,101,138,700.06
  5. Step 5: Solve for x
    x = 4,101,138,700.06/72,705.60
  6. Step 6: Final answer
    x = 56,407.47

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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.