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Finding the Fourth Proportional to 521.38, 719.34 and 355.30

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Solution

The fourth proportional to 521.38, 719.34 and 355.30 is: 490.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.38 : 719.34 = 355.30 : x
  2. Step 2: Convert to fraction form
    521.38/719.34 = 355.30/x
  3. Step 3: Cross multiply
    521.38x = 719.34 × 355.30
  4. Step 4: Simplify right side
    521.38x = 255,581.50
  5. Step 5: Solve for x
    x = 255,581.50/521.38
  6. Step 6: Final answer
    x = 490.20

Related Problems

Find fourth proportional to 260.69, 359.67 and 177.65
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Double scale
Find fourth proportional to 522.38, 720.72 and 356.30
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.