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Finding the Fourth Proportional to 72,759.56, 100,378.86 and 42,112.40

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Solution

The fourth proportional to 72,759.56, 100,378.86 and 42,112.40 is: 58,098.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,759.56 : 100,378.86 = 42,112.40 : x
  2. Step 2: Convert to fraction form
    72,759.56/100,378.86 = 42,112.40/x
  3. Step 3: Cross multiply
    72,759.56x = 100,378.86 × 42,112.40
  4. Step 4: Simplify right side
    72,759.56x = 4,227,194,703.86
  5. Step 5: Solve for x
    x = 4,227,194,703.86/72,759.56
  6. Step 6: Final answer
    x = 58,098.13

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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.