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Finding the Fourth Proportional to 99,690.95, 149,476.18 and 39,728.65

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Solution

The fourth proportional to 99,690.95, 149,476.18 and 39,728.65 is: 59,568.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,690.95 : 149,476.18 = 39,728.65 : x
  2. Step 2: Convert to fraction form
    99,690.95/149,476.18 = 39,728.65/x
  3. Step 3: Cross multiply
    99,690.95x = 149,476.18 × 39,728.65
  4. Step 4: Simplify right side
    99,690.95x = 5,938,486,838.56
  5. Step 5: Solve for x
    x = 5,938,486,838.56/99,690.95
  6. Step 6: Final answer
    x = 59,568.97

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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.