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Finding the Fourth Proportional to 715,162.15, 987,009.43 and 428,672.71

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Solution

The fourth proportional to 715,162.15, 987,009.43 and 428,672.71 is: 591,619.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,162.15 : 987,009.43 = 428,672.71 : x
  2. Step 2: Convert to fraction form
    715,162.15/987,009.43 = 428,672.71/x
  3. Step 3: Cross multiply
    715,162.15x = 987,009.43 × 428,672.71
  4. Step 4: Simplify right side
    715,162.15x = 423,104,001,361.93
  5. Step 5: Solve for x
    x = 423,104,001,361.93/715,162.15
  6. Step 6: Final answer
    x = 591,619.68

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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.