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Finding the Fourth Proportional to 857.66, 1,179.97 and 660.83

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Solution

The fourth proportional to 857.66, 1,179.97 and 660.83 is: 909.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.66 : 1,179.97 = 660.83 : x
  2. Step 2: Convert to fraction form
    857.66/1,179.97 = 660.83/x
  3. Step 3: Cross multiply
    857.66x = 1,179.97 × 660.83
  4. Step 4: Simplify right side
    857.66x = 779,752.02
  5. Step 5: Solve for x
    x = 779,752.02/857.66
  6. Step 6: Final answer
    x = 909.17

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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.