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Finding the Fourth Proportional to 903.78, 1,247.13 and 717.72

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Solution

The fourth proportional to 903.78, 1,247.13 and 717.72 is: 990.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.78 : 1,247.13 = 717.72 : x
  2. Step 2: Convert to fraction form
    903.78/1,247.13 = 717.72/x
  3. Step 3: Cross multiply
    903.78x = 1,247.13 × 717.72
  4. Step 4: Simplify right side
    903.78x = 895,090.14
  5. Step 5: Solve for x
    x = 895,090.14/903.78
  6. Step 6: Final answer
    x = 990.38

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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.