Home / 78,878.35-118,240.98-31,479.76

Finding the Fourth Proportional to 78,878.35, 118,240.98 and 31,479.76

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Solution

The fourth proportional to 78,878.35, 118,240.98 and 31,479.76 is: 47,189.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,878.35 : 118,240.98 = 31,479.76 : x
  2. Step 2: Convert to fraction form
    78,878.35/118,240.98 = 31,479.76/x
  3. Step 3: Cross multiply
    78,878.35x = 118,240.98 × 31,479.76
  4. Step 4: Simplify right side
    78,878.35x = 3,722,197,672.56
  5. Step 5: Solve for x
    x = 3,722,197,672.56/78,878.35
  6. Step 6: Final answer
    x = 47,189.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.