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Finding the Fourth Proportional to 1,135.19, 1,564.24 and 781.22

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Solution

The fourth proportional to 1,135.19, 1,564.24 and 781.22 is: 1,076.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.19 : 1,564.24 = 781.22 : x
  2. Step 2: Convert to fraction form
    1,135.19/1,564.24 = 781.22/x
  3. Step 3: Cross multiply
    1,135.19x = 1,564.24 × 781.22
  4. Step 4: Simplify right side
    1,135.19x = 1,222,015.57
  5. Step 5: Solve for x
    x = 1,222,015.57/1,135.19
  6. Step 6: Final answer
    x = 1,076.49

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Half scale
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Double scale
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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.