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Finding the Fourth Proportional to 904.30, 1,247.92 and 490.30

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Solution

The fourth proportional to 904.30, 1,247.92 and 490.30 is: 676.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.30 : 1,247.92 = 490.30 : x
  2. Step 2: Convert to fraction form
    904.30/1,247.92 = 490.30/x
  3. Step 3: Cross multiply
    904.30x = 1,247.92 × 490.30
  4. Step 4: Simplify right side
    904.30x = 611,855.18
  5. Step 5: Solve for x
    x = 611,855.18/904.30
  6. Step 6: Final answer
    x = 676.61

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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.