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Finding the Fourth Proportional to 155,903.95, 215,153.72 and 86,999.44

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Solution

The fourth proportional to 155,903.95, 215,153.72 and 86,999.44 is: 120,062.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,903.95 : 215,153.72 = 86,999.44 : x
  2. Step 2: Convert to fraction form
    155,903.95/215,153.72 = 86,999.44/x
  3. Step 3: Cross multiply
    155,903.95x = 215,153.72 × 86,999.44
  4. Step 4: Simplify right side
    155,903.95x = 18,718,253,153.92
  5. Step 5: Solve for x
    x = 18,718,253,153.92/155,903.95
  6. Step 6: Final answer
    x = 120,062.73

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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.