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Finding the Fourth Proportional to 857.17, 1,182.36 and 691.39

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Solution

The fourth proportional to 857.17, 1,182.36 and 691.39 is: 953.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.17 : 1,182.36 = 691.39 : x
  2. Step 2: Convert to fraction form
    857.17/1,182.36 = 691.39/x
  3. Step 3: Cross multiply
    857.17x = 1,182.36 × 691.39
  4. Step 4: Simplify right side
    857.17x = 817,471.88
  5. Step 5: Solve for x
    x = 817,471.88/857.17
  6. Step 6: Final answer
    x = 953.69

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1.5x scale

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.