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Finding the Fourth Proportional to 521.60, 782.80 and 375.28

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Solution

The fourth proportional to 521.60, 782.80 and 375.28 is: 563.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.60 : 782.80 = 375.28 : x
  2. Step 2: Convert to fraction form
    521.60/782.80 = 375.28/x
  3. Step 3: Cross multiply
    521.60x = 782.80 × 375.28
  4. Step 4: Simplify right side
    521.60x = 293,769.18
  5. Step 5: Solve for x
    x = 293,769.18/521.60
  6. Step 6: Final answer
    x = 563.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.