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Finding the Fourth Proportional to 881.68, 1,315.86 and 858.64

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Solution

The fourth proportional to 881.68, 1,315.86 and 858.64 is: 1,281.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.68 : 1,315.86 = 858.64 : x
  2. Step 2: Convert to fraction form
    881.68/1,315.86 = 858.64/x
  3. Step 3: Cross multiply
    881.68x = 1,315.86 × 858.64
  4. Step 4: Simplify right side
    881.68x = 1,129,850.03
  5. Step 5: Solve for x
    x = 1,129,850.03/881.68
  6. Step 6: Final answer
    x = 1,281.47

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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.