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Finding the Fourth Proportional to 717.17, 990.59 and 553.37

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Solution

The fourth proportional to 717.17, 990.59 and 553.37 is: 764.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.17 : 990.59 = 553.37 : x
  2. Step 2: Convert to fraction form
    717.17/990.59 = 553.37/x
  3. Step 3: Cross multiply
    717.17x = 990.59 × 553.37
  4. Step 4: Simplify right side
    717.17x = 548,162.79
  5. Step 5: Solve for x
    x = 548,162.79/717.17
  6. Step 6: Final answer
    x = 764.34

Related Problems

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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.