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Finding the Fourth Proportional to 521.36, 719.20 and 355.28

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Solution

The fourth proportional to 521.36, 719.20 and 355.28 is: 490.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.36 : 719.20 = 355.28 : x
  2. Step 2: Convert to fraction form
    521.36/719.20 = 355.28/x
  3. Step 3: Cross multiply
    521.36x = 719.20 × 355.28
  4. Step 4: Simplify right side
    521.36x = 255,517.38
  5. Step 5: Solve for x
    x = 255,517.38/521.36
  6. Step 6: Final answer
    x = 490.10

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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.