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Finding the Fourth Proportional to 318,720.76, 439,702.86 and 189,633.42

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Solution

The fourth proportional to 318,720.76, 439,702.86 and 189,633.42 is: 261,615.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,720.76 : 439,702.86 = 189,633.42 : x
  2. Step 2: Convert to fraction form
    318,720.76/439,702.86 = 189,633.42/x
  3. Step 3: Cross multiply
    318,720.76x = 439,702.86 × 189,633.42
  4. Step 4: Simplify right side
    318,720.76x = 83,382,357,125.58
  5. Step 5: Solve for x
    x = 83,382,357,125.58/318,720.76
  6. Step 6: Final answer
    x = 261,615.71

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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.