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Finding the Fourth Proportional to 155,978.90, 215,250.88 and 84,358.92

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Solution

The fourth proportional to 155,978.90, 215,250.88 and 84,358.92 is: 116,415.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,978.90 : 215,250.88 = 84,358.92 : x
  2. Step 2: Convert to fraction form
    155,978.90/215,250.88 = 84,358.92/x
  3. Step 3: Cross multiply
    155,978.90x = 215,250.88 × 84,358.92
  4. Step 4: Simplify right side
    155,978.90x = 18,158,331,765.85
  5. Step 5: Solve for x
    x = 18,158,331,765.85/155,978.90
  6. Step 6: Final answer
    x = 116,415.31

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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.