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Finding the Fourth Proportional to 265,719.84, 398,511.71 and 78,687.60

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Solution

The fourth proportional to 265,719.84, 398,511.71 and 78,687.60 is: 118,011.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,719.84 : 398,511.71 = 78,687.60 : x
  2. Step 2: Convert to fraction form
    265,719.84/398,511.71 = 78,687.60/x
  3. Step 3: Cross multiply
    265,719.84x = 398,511.71 × 78,687.60
  4. Step 4: Simplify right side
    265,719.84x = 31,357,930,031.80
  5. Step 5: Solve for x
    x = 31,357,930,031.80/265,719.84
  6. Step 6: Final answer
    x = 118,011.25

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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.