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Finding the Fourth Proportional to 391,630.72, 540,477.12 and 221,866.24

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Solution

The fourth proportional to 391,630.72, 540,477.12 and 221,866.24 is: 306,190.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,630.72 : 540,477.12 = 221,866.24 : x
  2. Step 2: Convert to fraction form
    391,630.72/540,477.12 = 221,866.24/x
  3. Step 3: Cross multiply
    391,630.72x = 540,477.12 × 221,866.24
  4. Step 4: Simplify right side
    391,630.72x = 119,913,626,420.43
  5. Step 5: Solve for x
    x = 119,913,626,420.43/391,630.72
  6. Step 6: Final answer
    x = 306,190.55

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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.