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Finding the Fourth Proportional to 686.70, 1,029.60 and 247.77

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Solution

The fourth proportional to 686.70, 1,029.60 and 247.77 is: 371.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.70 : 1,029.60 = 247.77 : x
  2. Step 2: Convert to fraction form
    686.70/1,029.60 = 247.77/x
  3. Step 3: Cross multiply
    686.70x = 1,029.60 × 247.77
  4. Step 4: Simplify right side
    686.70x = 255,103.99
  5. Step 5: Solve for x
    x = 255,103.99/686.70
  6. Step 6: Final answer
    x = 371.49

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.