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Finding the Fourth Proportional to 153,728.50, 212,145.34 and 86,660.50

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Solution

The fourth proportional to 153,728.50, 212,145.34 and 86,660.50 is: 119,591.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,728.50 : 212,145.34 = 86,660.50 : x
  2. Step 2: Convert to fraction form
    153,728.50/212,145.34 = 86,660.50/x
  3. Step 3: Cross multiply
    153,728.50x = 212,145.34 × 86,660.50
  4. Step 4: Simplify right side
    153,728.50x = 18,384,620,803.77
  5. Step 5: Solve for x
    x = 18,384,620,803.77/153,728.50
  6. Step 6: Final answer
    x = 119,591.49

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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.