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Finding the Fourth Proportional to 155,880.69, 215,115.25 and 84,260.71

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Solution

The fourth proportional to 155,880.69, 215,115.25 and 84,260.71 is: 116,279.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,880.69 : 215,115.25 = 84,260.71 : x
  2. Step 2: Convert to fraction form
    155,880.69/215,115.25 = 84,260.71/x
  3. Step 3: Cross multiply
    155,880.69x = 215,115.25 × 84,260.71
  4. Step 4: Simplify right side
    155,880.69x = 18,125,762,621.25
  5. Step 5: Solve for x
    x = 18,125,762,621.25/155,880.69
  6. Step 6: Final answer
    x = 116,279.72

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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.