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Finding the Fourth Proportional to 521.63, 719.62 and 311.74

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Solution

The fourth proportional to 521.63, 719.62 and 311.74 is: 430.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.63 : 719.62 = 311.74 : x
  2. Step 2: Convert to fraction form
    521.63/719.62 = 311.74/x
  3. Step 3: Cross multiply
    521.63x = 719.62 × 311.74
  4. Step 4: Simplify right side
    521.63x = 224,334.34
  5. Step 5: Solve for x
    x = 224,334.34/521.63
  6. Step 6: Final answer
    x = 430.06

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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.