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Finding the Fourth Proportional to 906.32, 1,248.86 and 857.30

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Solution

The fourth proportional to 906.32, 1,248.86 and 857.30 is: 1,181.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.32 : 1,248.86 = 857.30 : x
  2. Step 2: Convert to fraction form
    906.32/1,248.86 = 857.30/x
  3. Step 3: Cross multiply
    906.32x = 1,248.86 × 857.30
  4. Step 4: Simplify right side
    906.32x = 1,070,647.68
  5. Step 5: Solve for x
    x = 1,070,647.68/906.32
  6. Step 6: Final answer
    x = 1,181.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.