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Finding the Fourth Proportional to 910.37, 1,255.43 and 578.20

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Solution

The fourth proportional to 910.37, 1,255.43 and 578.20 is: 797.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.37 : 1,255.43 = 578.20 : x
  2. Step 2: Convert to fraction form
    910.37/1,255.43 = 578.20/x
  3. Step 3: Cross multiply
    910.37x = 1,255.43 × 578.20
  4. Step 4: Simplify right side
    910.37x = 725,889.63
  5. Step 5: Solve for x
    x = 725,889.63/910.37
  6. Step 6: Final answer
    x = 797.36

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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.