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Finding the Fourth Proportional to 879.42, 1,315.88 and 685.02

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Solution

The fourth proportional to 879.42, 1,315.88 and 685.02 is: 1,025.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.42 : 1,315.88 = 685.02 : x
  2. Step 2: Convert to fraction form
    879.42/1,315.88 = 685.02/x
  3. Step 3: Cross multiply
    879.42x = 1,315.88 × 685.02
  4. Step 4: Simplify right side
    879.42x = 901,404.12
  5. Step 5: Solve for x
    x = 901,404.12/879.42
  6. Step 6: Final answer
    x = 1,025.00

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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.