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Finding the Fourth Proportional to 521.23, 719.11 and 355.52

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Solution

The fourth proportional to 521.23, 719.11 and 355.52 is: 490.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.23 : 719.11 = 355.52 : x
  2. Step 2: Convert to fraction form
    521.23/719.11 = 355.52/x
  3. Step 3: Cross multiply
    521.23x = 719.11 × 355.52
  4. Step 4: Simplify right side
    521.23x = 255,657.99
  5. Step 5: Solve for x
    x = 255,657.99/521.23
  6. Step 6: Final answer
    x = 490.49

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.