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Finding the Fourth Proportional to 890.19, 1,228.46 and 517.20

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Solution

The fourth proportional to 890.19, 1,228.46 and 517.20 is: 713.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.19 : 1,228.46 = 517.20 : x
  2. Step 2: Convert to fraction form
    890.19/1,228.46 = 517.20/x
  3. Step 3: Cross multiply
    890.19x = 1,228.46 × 517.20
  4. Step 4: Simplify right side
    890.19x = 635,356.93
  5. Step 5: Solve for x
    x = 635,356.93/890.19
  6. Step 6: Final answer
    x = 713.73

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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.