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Finding the Fourth Proportional to 871.74, 1,302.44 and 831.42

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Solution

The fourth proportional to 871.74, 1,302.44 and 831.42 is: 1,242.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.74 : 1,302.44 = 831.42 : x
  2. Step 2: Convert to fraction form
    871.74/1,302.44 = 831.42/x
  3. Step 3: Cross multiply
    871.74x = 1,302.44 × 831.42
  4. Step 4: Simplify right side
    871.74x = 1,082,870.51
  5. Step 5: Solve for x
    x = 1,082,870.51/871.74
  6. Step 6: Final answer
    x = 1,242.19

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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.