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Finding the Fourth Proportional to 72,143.80, 99,543.34 and 42,319.80

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Solution

The fourth proportional to 72,143.80, 99,543.34 and 42,319.80 is: 58,392.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,143.80 : 99,543.34 = 42,319.80 : x
  2. Step 2: Convert to fraction form
    72,143.80/99,543.34 = 42,319.80/x
  3. Step 3: Cross multiply
    72,143.80x = 99,543.34 × 42,319.80
  4. Step 4: Simplify right side
    72,143.80x = 4,212,654,240.13
  5. Step 5: Solve for x
    x = 4,212,654,240.13/72,143.80
  6. Step 6: Final answer
    x = 58,392.46

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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.