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Finding the Fourth Proportional to 1,131.39, 1,561.47 and 659.44

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Solution

The fourth proportional to 1,131.39, 1,561.47 and 659.44 is: 910.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.39 : 1,561.47 = 659.44 : x
  2. Step 2: Convert to fraction form
    1,131.39/1,561.47 = 659.44/x
  3. Step 3: Cross multiply
    1,131.39x = 1,561.47 × 659.44
  4. Step 4: Simplify right side
    1,131.39x = 1,029,690.18
  5. Step 5: Solve for x
    x = 1,029,690.18/1,131.39
  6. Step 6: Final answer
    x = 910.11

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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.