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Finding the Fourth Proportional to 521.57, 719.78 and 300.53

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Solution

The fourth proportional to 521.57, 719.78 and 300.53 is: 414.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.57 : 719.78 = 300.53 : x
  2. Step 2: Convert to fraction form
    521.57/719.78 = 300.53/x
  3. Step 3: Cross multiply
    521.57x = 719.78 × 300.53
  4. Step 4: Simplify right side
    521.57x = 216,315.78
  5. Step 5: Solve for x
    x = 216,315.78/521.57
  6. Step 6: Final answer
    x = 414.74

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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.