Home / 391,454.84-540,189.60-221,690.18

Finding the Fourth Proportional to 391,454.84, 540,189.60 and 221,690.18

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Solution

The fourth proportional to 391,454.84, 540,189.60 and 221,690.18 is: 305,922.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,454.84 : 540,189.60 = 221,690.18 : x
  2. Step 2: Convert to fraction form
    391,454.84/540,189.60 = 221,690.18/x
  3. Step 3: Cross multiply
    391,454.84x = 540,189.60 × 221,690.18
  4. Step 4: Simplify right side
    391,454.84x = 119,754,729,658.13
  5. Step 5: Solve for x
    x = 119,754,729,658.13/391,454.84
  6. Step 6: Final answer
    x = 305,922.21

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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.