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Finding the Fourth Proportional to 715,728.34, 987,719.23 and 393,468.42

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Solution

The fourth proportional to 715,728.34, 987,719.23 and 393,468.42 is: 542,994.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,728.34 : 987,719.23 = 393,468.42 : x
  2. Step 2: Convert to fraction form
    715,728.34/987,719.23 = 393,468.42/x
  3. Step 3: Cross multiply
    715,728.34x = 987,719.23 × 393,468.42
  4. Step 4: Simplify right side
    715,728.34x = 388,636,324,831.72
  5. Step 5: Solve for x
    x = 388,636,324,831.72/715,728.34
  6. Step 6: Final answer
    x = 542,994.18

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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.