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Finding the Fourth Proportional to 877.16, 1,315.36 and 389.88

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Solution

The fourth proportional to 877.16, 1,315.36 and 389.88 is: 584.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.16 : 1,315.36 = 389.88 : x
  2. Step 2: Convert to fraction form
    877.16/1,315.36 = 389.88/x
  3. Step 3: Cross multiply
    877.16x = 1,315.36 × 389.88
  4. Step 4: Simplify right side
    877.16x = 512,832.56
  5. Step 5: Solve for x
    x = 512,832.56/877.16
  6. Step 6: Final answer
    x = 584.65

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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.