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Finding the Fourth Proportional to 715,738.96, 987,708 and 393,442.12

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Solution

The fourth proportional to 715,738.96, 987,708 and 393,442.12 is: 542,943.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,738.96 : 987,708 = 393,442.12 : x
  2. Step 2: Convert to fraction form
    715,738.96/987,708 = 393,442.12/x
  3. Step 3: Cross multiply
    715,738.96x = 987,708 × 393,442.12
  4. Step 4: Simplify right side
    715,738.96x = 388,605,929,460.96
  5. Step 5: Solve for x
    x = 388,605,929,460.96/715,738.96
  6. Step 6: Final answer
    x = 542,943.66

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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.