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Finding the Fourth Proportional to 1,207.26, 1,666.32 and 788.65

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Solution

The fourth proportional to 1,207.26, 1,666.32 and 788.65 is: 1,088.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.26 : 1,666.32 = 788.65 : x
  2. Step 2: Convert to fraction form
    1,207.26/1,666.32 = 788.65/x
  3. Step 3: Cross multiply
    1,207.26x = 1,666.32 × 788.65
  4. Step 4: Simplify right side
    1,207.26x = 1,314,143.27
  5. Step 5: Solve for x
    x = 1,314,143.27/1,207.26
  6. Step 6: Final answer
    x = 1,088.53

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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.