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Finding the Fourth Proportional to 880.13, 1,317.45 and 649.28

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Solution

The fourth proportional to 880.13, 1,317.45 and 649.28 is: 971.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.13 : 1,317.45 = 649.28 : x
  2. Step 2: Convert to fraction form
    880.13/1,317.45 = 649.28/x
  3. Step 3: Cross multiply
    880.13x = 1,317.45 × 649.28
  4. Step 4: Simplify right side
    880.13x = 855,393.94
  5. Step 5: Solve for x
    x = 855,393.94/880.13
  6. Step 6: Final answer
    x = 971.89

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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.