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Finding the Fourth Proportional to 391,686.75, 540,549.59 and 221,975.55

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Solution

The fourth proportional to 391,686.75, 540,549.59 and 221,975.55 is: 306,338.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,686.75 : 540,549.59 = 221,975.55 : x
  2. Step 2: Convert to fraction form
    391,686.75/540,549.59 = 221,975.55/x
  3. Step 3: Cross multiply
    391,686.75x = 540,549.59 × 221,975.55
  4. Step 4: Simplify right side
    391,686.75x = 119,988,791,432.65
  5. Step 5: Solve for x
    x = 119,988,791,432.65/391,686.75
  6. Step 6: Final answer
    x = 306,338.65

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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.