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Finding the Fourth Proportional to 391,600.32, 540,495.36 and 221,928

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Solution

The fourth proportional to 391,600.32, 540,495.36 and 221,928 is: 306,309.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,600.32 : 540,495.36 = 221,928 : x
  2. Step 2: Convert to fraction form
    391,600.32/540,495.36 = 221,928/x
  3. Step 3: Cross multiply
    391,600.32x = 540,495.36 × 221,928
  4. Step 4: Simplify right side
    391,600.32x = 119,951,054,254.08
  5. Step 5: Solve for x
    x = 119,951,054,254.08/391,600.32
  6. Step 6: Final answer
    x = 306,309.90

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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.