Home / 391,412.17-540,148.78-221,679.10

Finding the Fourth Proportional to 391,412.17, 540,148.78 and 221,679.10

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Solution

The fourth proportional to 391,412.17, 540,148.78 and 221,679.10 is: 305,917.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,412.17 : 540,148.78 = 221,679.10 : x
  2. Step 2: Convert to fraction form
    391,412.17/540,148.78 = 221,679.10/x
  3. Step 3: Cross multiply
    391,412.17x = 540,148.78 × 221,679.10
  4. Step 4: Simplify right side
    391,412.17x = 119,739,694,343.23
  5. Step 5: Solve for x
    x = 119,739,694,343.23/391,412.17
  6. Step 6: Final answer
    x = 305,917.15

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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.