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Finding the Fourth Proportional to 391,592.72, 540,424.68 and 221,828.24

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Solution

The fourth proportional to 391,592.72, 540,424.68 and 221,828.24 is: 306,138.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,592.72 : 540,424.68 = 221,828.24 : x
  2. Step 2: Convert to fraction form
    391,592.72/540,424.68 = 221,828.24/x
  3. Step 3: Cross multiply
    391,592.72x = 540,424.68 × 221,828.24
  4. Step 4: Simplify right side
    391,592.72x = 119,881,455,616.96
  5. Step 5: Solve for x
    x = 119,881,455,616.96/391,592.72
  6. Step 6: Final answer
    x = 306,138.11

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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.