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Finding the Fourth Proportional to 651,350.40, 976,879.80 and 428,276.40

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Solution

The fourth proportional to 651,350.40, 976,879.80 and 428,276.40 is: 642,318.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    651,350.40 : 976,879.80 = 428,276.40 : x
  2. Step 2: Convert to fraction form
    651,350.40/976,879.80 = 428,276.40/x
  3. Step 3: Cross multiply
    651,350.40x = 976,879.80 × 428,276.40
  4. Step 4: Simplify right side
    651,350.40x = 418,374,563,976.72
  5. Step 5: Solve for x
    x = 418,374,563,976.72/651,350.40
  6. Step 6: Final answer
    x = 642,318.73

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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.