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Finding the Fourth Proportional to 910.31, 1,255.49 and 578.16

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Solution

The fourth proportional to 910.31, 1,255.49 and 578.16 is: 797.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.31 : 1,255.49 = 578.16 : x
  2. Step 2: Convert to fraction form
    910.31/1,255.49 = 578.16/x
  3. Step 3: Cross multiply
    910.31x = 1,255.49 × 578.16
  4. Step 4: Simplify right side
    910.31x = 725,874.10
  5. Step 5: Solve for x
    x = 725,874.10/910.31
  6. Step 6: Final answer
    x = 797.39

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Half scale
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Double scale
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1.5x scale

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.