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Finding the Fourth Proportional to 410.40, 565.75 and 311.99

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Solution

The fourth proportional to 410.40, 565.75 and 311.99 is: 430.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    410.40 : 565.75 = 311.99 : x
  2. Step 2: Convert to fraction form
    410.40/565.75 = 311.99/x
  3. Step 3: Cross multiply
    410.40x = 565.75 × 311.99
  4. Step 4: Simplify right side
    410.40x = 176,508.34
  5. Step 5: Solve for x
    x = 176,508.34/410.40
  6. Step 6: Final answer
    x = 430.09

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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.