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Finding the Fourth Proportional to 72,489.32, 100,036.05 and 40,224.50

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Solution

The fourth proportional to 72,489.32, 100,036.05 and 40,224.50 is: 55,510.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,489.32 : 100,036.05 = 40,224.50 : x
  2. Step 2: Convert to fraction form
    72,489.32/100,036.05 = 40,224.50/x
  3. Step 3: Cross multiply
    72,489.32x = 100,036.05 × 40,224.50
  4. Step 4: Simplify right side
    72,489.32x = 4,023,900,093.23
  5. Step 5: Solve for x
    x = 4,023,900,093.23/72,489.32
  6. Step 6: Final answer
    x = 55,510.25

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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.