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Finding the Fourth Proportional to 1,211.01, 1,671.19 and 687.04

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Solution

The fourth proportional to 1,211.01, 1,671.19 and 687.04 is: 948.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.01 : 1,671.19 = 687.04 : x
  2. Step 2: Convert to fraction form
    1,211.01/1,671.19 = 687.04/x
  3. Step 3: Cross multiply
    1,211.01x = 1,671.19 × 687.04
  4. Step 4: Simplify right side
    1,211.01x = 1,148,174.38
  5. Step 5: Solve for x
    x = 1,148,174.38/1,211.01
  6. Step 6: Final answer
    x = 948.11

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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.