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Finding the Fourth Proportional to 391,036.59, 539,674.38 and 221,281.65

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Solution

The fourth proportional to 391,036.59, 539,674.38 and 221,281.65 is: 305,393.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,036.59 : 539,674.38 = 221,281.65 : x
  2. Step 2: Convert to fraction form
    391,036.59/539,674.38 = 221,281.65/x
  3. Step 3: Cross multiply
    391,036.59x = 539,674.38 × 221,281.65
  4. Step 4: Simplify right side
    391,036.59x = 119,420,037,269.13
  5. Step 5: Solve for x
    x = 119,420,037,269.13/391,036.59
  6. Step 6: Final answer
    x = 305,393.51

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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.