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Finding the Fourth Proportional to 1,246.70, 1,868.29 and 691.65

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Solution

The fourth proportional to 1,246.70, 1,868.29 and 691.65 is: 1,036.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.70 : 1,868.29 = 691.65 : x
  2. Step 2: Convert to fraction form
    1,246.70/1,868.29 = 691.65/x
  3. Step 3: Cross multiply
    1,246.70x = 1,868.29 × 691.65
  4. Step 4: Simplify right side
    1,246.70x = 1,292,199.32
  5. Step 5: Solve for x
    x = 1,292,199.32/1,246.70
  6. Step 6: Final answer
    x = 1,036.50

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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.