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Finding the Fourth Proportional to 831.48, 1,240.08 and 787.74

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Solution

The fourth proportional to 831.48, 1,240.08 and 787.74 is: 1,174.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.48 : 1,240.08 = 787.74 : x
  2. Step 2: Convert to fraction form
    831.48/1,240.08 = 787.74/x
  3. Step 3: Cross multiply
    831.48x = 1,240.08 × 787.74
  4. Step 4: Simplify right side
    831.48x = 976,860.62
  5. Step 5: Solve for x
    x = 976,860.62/831.48
  6. Step 6: Final answer
    x = 1,174.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.