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Finding the Fourth Proportional to 763.49, 1,052.99 and 665.08

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Solution

The fourth proportional to 763.49, 1,052.99 and 665.08 is: 917.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.49 : 1,052.99 = 665.08 : x
  2. Step 2: Convert to fraction form
    763.49/1,052.99 = 665.08/x
  3. Step 3: Cross multiply
    763.49x = 1,052.99 × 665.08
  4. Step 4: Simplify right side
    763.49x = 700,317.32
  5. Step 5: Solve for x
    x = 700,317.32/763.49
  6. Step 6: Final answer
    x = 917.26

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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.