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Finding the Fourth Proportional to 1,150.78, 1,588.08 and 685

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Solution

The fourth proportional to 1,150.78, 1,588.08 and 685 is: 945.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,150.78 : 1,588.08 = 685 : x
  2. Step 2: Convert to fraction form
    1,150.78/1,588.08 = 685/x
  3. Step 3: Cross multiply
    1,150.78x = 1,588.08 × 685
  4. Step 4: Simplify right side
    1,150.78x = 1,087,834.80
  5. Step 5: Solve for x
    x = 1,087,834.80/1,150.78
  6. Step 6: Final answer
    x = 945.30

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Double scale
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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.