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Finding the Fourth Proportional to 877.40, 1,315.92 and 389.96

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Solution

The fourth proportional to 877.40, 1,315.92 and 389.96 is: 584.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.40 : 1,315.92 = 389.96 : x
  2. Step 2: Convert to fraction form
    877.40/1,315.92 = 389.96/x
  3. Step 3: Cross multiply
    877.40x = 1,315.92 × 389.96
  4. Step 4: Simplify right side
    877.40x = 513,156.16
  5. Step 5: Solve for x
    x = 513,156.16/877.40
  6. Step 6: Final answer
    x = 584.86

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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.