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Finding the Fourth Proportional to 99,987.70, 149,981.55 and 73,415.65

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Solution

The fourth proportional to 99,987.70, 149,981.55 and 73,415.65 is: 110,123.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,987.70 : 149,981.55 = 73,415.65 : x
  2. Step 2: Convert to fraction form
    99,987.70/149,981.55 = 73,415.65/x
  3. Step 3: Cross multiply
    99,987.70x = 149,981.55 × 73,415.65
  4. Step 4: Simplify right side
    99,987.70x = 11,010,992,981.26
  5. Step 5: Solve for x
    x = 11,010,992,981.26/99,987.70
  6. Step 6: Final answer
    x = 110,123.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.