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Finding the Fourth Proportional to 391,376.18, 540,195.93 and 221,710.34

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Solution

The fourth proportional to 391,376.18, 540,195.93 and 221,710.34 is: 306,015.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,376.18 : 540,195.93 = 221,710.34 : x
  2. Step 2: Convert to fraction form
    391,376.18/540,195.93 = 221,710.34/x
  3. Step 3: Cross multiply
    391,376.18x = 540,195.93 × 221,710.34
  4. Step 4: Simplify right side
    391,376.18x = 119,767,023,306.92
  5. Step 5: Solve for x
    x = 119,767,023,306.92/391,376.18
  6. Step 6: Final answer
    x = 306,015.11

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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.