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Finding the Fourth Proportional to 1,218.38, 1,680.95 and 746.10

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Solution

The fourth proportional to 1,218.38, 1,680.95 and 746.10 is: 1,029.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.38 : 1,680.95 = 746.10 : x
  2. Step 2: Convert to fraction form
    1,218.38/1,680.95 = 746.10/x
  3. Step 3: Cross multiply
    1,218.38x = 1,680.95 × 746.10
  4. Step 4: Simplify right side
    1,218.38x = 1,254,158.66
  5. Step 5: Solve for x
    x = 1,254,158.66/1,218.38
  6. Step 6: Final answer
    x = 1,029.37

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Half scale
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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.