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Finding the Fourth Proportional to 65,387.72, 90,211.86 and 42,739.79

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Solution

The fourth proportional to 65,387.72, 90,211.86 and 42,739.79 is: 58,965.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,387.72 : 90,211.86 = 42,739.79 : x
  2. Step 2: Convert to fraction form
    65,387.72/90,211.86 = 42,739.79/x
  3. Step 3: Cross multiply
    65,387.72x = 90,211.86 × 42,739.79
  4. Step 4: Simplify right side
    65,387.72x = 3,855,635,500.85
  5. Step 5: Solve for x
    x = 3,855,635,500.85/65,387.72
  6. Step 6: Final answer
    x = 58,965.74

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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.