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Finding the Fourth Proportional to 72,872.70, 100,571.48 and 42,656.20

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Solution

The fourth proportional to 72,872.70, 100,571.48 and 42,656.20 is: 58,869.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,872.70 : 100,571.48 = 42,656.20 : x
  2. Step 2: Convert to fraction form
    72,872.70/100,571.48 = 42,656.20/x
  3. Step 3: Cross multiply
    72,872.70x = 100,571.48 × 42,656.20
  4. Step 4: Simplify right side
    72,872.70x = 4,289,997,165.18
  5. Step 5: Solve for x
    x = 4,289,997,165.18/72,872.70
  6. Step 6: Final answer
    x = 58,869.74

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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.