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Finding the Fourth Proportional to 715,515.64, 987,412.33 and 393,218.82

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Solution

The fourth proportional to 715,515.64, 987,412.33 and 393,218.82 is: 542,642.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,515.64 : 987,412.33 = 393,218.82 : x
  2. Step 2: Convert to fraction form
    715,515.64/987,412.33 = 393,218.82/x
  3. Step 3: Cross multiply
    715,515.64x = 987,412.33 × 393,218.82
  4. Step 4: Simplify right side
    715,515.64x = 388,269,109,535.72
  5. Step 5: Solve for x
    x = 388,269,109,535.72/715,515.64
  6. Step 6: Final answer
    x = 542,642.38

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1.5x scale

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.