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Finding the Fourth Proportional to 155,879.76, 215,116.34 and 87,900

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Solution

The fourth proportional to 155,879.76, 215,116.34 and 87,900 is: 121,303.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,879.76 : 215,116.34 = 87,900 : x
  2. Step 2: Convert to fraction form
    155,879.76/215,116.34 = 87,900/x
  3. Step 3: Cross multiply
    155,879.76x = 215,116.34 × 87,900
  4. Step 4: Simplify right side
    155,879.76x = 18,908,726,286
  5. Step 5: Solve for x
    x = 18,908,726,286/155,879.76
  6. Step 6: Final answer
    x = 121,303.28

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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.