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Finding the Fourth Proportional to 831.04, 1,247.02 and 368.80

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Solution

The fourth proportional to 831.04, 1,247.02 and 368.80 is: 553.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.04 : 1,247.02 = 368.80 : x
  2. Step 2: Convert to fraction form
    831.04/1,247.02 = 368.80/x
  3. Step 3: Cross multiply
    831.04x = 1,247.02 × 368.80
  4. Step 4: Simplify right side
    831.04x = 459,900.98
  5. Step 5: Solve for x
    x = 459,900.98/831.04
  6. Step 6: Final answer
    x = 553.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.