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Finding the Fourth Proportional to 880.90, 1,317.57 and 857.32

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Solution

The fourth proportional to 880.90, 1,317.57 and 857.32 is: 1,282.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.90 : 1,317.57 = 857.32 : x
  2. Step 2: Convert to fraction form
    880.90/1,317.57 = 857.32/x
  3. Step 3: Cross multiply
    880.90x = 1,317.57 × 857.32
  4. Step 4: Simplify right side
    880.90x = 1,129,579.11
  5. Step 5: Solve for x
    x = 1,129,579.11/880.90
  6. Step 6: Final answer
    x = 1,282.30

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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.