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Finding the Fourth Proportional to 72,855.70, 100,543.36 and 42,643.84

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Solution

The fourth proportional to 72,855.70, 100,543.36 and 42,643.84 is: 58,849.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,855.70 : 100,543.36 = 42,643.84 : x
  2. Step 2: Convert to fraction form
    72,855.70/100,543.36 = 42,643.84/x
  3. Step 3: Cross multiply
    72,855.70x = 100,543.36 × 42,643.84
  4. Step 4: Simplify right side
    72,855.70x = 4,287,554,956.90
  5. Step 5: Solve for x
    x = 4,287,554,956.90/72,855.70
  6. Step 6: Final answer
    x = 58,849.96

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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.