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Finding the Fourth Proportional to 521.40, 719.70 and 355.26

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Solution

The fourth proportional to 521.40, 719.70 and 355.26 is: 490.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.40 : 719.70 = 355.26 : x
  2. Step 2: Convert to fraction form
    521.40/719.70 = 355.26/x
  3. Step 3: Cross multiply
    521.40x = 719.70 × 355.26
  4. Step 4: Simplify right side
    521.40x = 255,680.62
  5. Step 5: Solve for x
    x = 255,680.62/521.40
  6. Step 6: Final answer
    x = 490.37

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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.