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Finding the Fourth Proportional to 391,364.52, 540,085.16 and 221,631.72

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Solution

The fourth proportional to 391,364.52, 540,085.16 and 221,631.72 is: 305,852.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,364.52 : 540,085.16 = 221,631.72 : x
  2. Step 2: Convert to fraction form
    391,364.52/540,085.16 = 221,631.72/x
  3. Step 3: Cross multiply
    391,364.52x = 540,085.16 × 221,631.72
  4. Step 4: Simplify right side
    391,364.52x = 119,700,002,957.28
  5. Step 5: Solve for x
    x = 119,700,002,957.28/391,364.52
  6. Step 6: Final answer
    x = 305,852.98

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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.