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Finding the Fourth Proportional to 421,418.70, 632,128.05 and 279,701.10

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Solution

The fourth proportional to 421,418.70, 632,128.05 and 279,701.10 is: 419,551.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,418.70 : 632,128.05 = 279,701.10 : x
  2. Step 2: Convert to fraction form
    421,418.70/632,128.05 = 279,701.10/x
  3. Step 3: Cross multiply
    421,418.70x = 632,128.05 × 279,701.10
  4. Step 4: Simplify right side
    421,418.70x = 176,806,910,925.86
  5. Step 5: Solve for x
    x = 176,806,910,925.86/421,418.70
  6. Step 6: Final answer
    x = 419,551.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.