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Finding the Fourth Proportional to 370.40, 510.78 and 318.12

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Solution

The fourth proportional to 370.40, 510.78 and 318.12 is: 438.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.40 : 510.78 = 318.12 : x
  2. Step 2: Convert to fraction form
    370.40/510.78 = 318.12/x
  3. Step 3: Cross multiply
    370.40x = 510.78 × 318.12
  4. Step 4: Simplify right side
    370.40x = 162,488.80
  5. Step 5: Solve for x
    x = 162,488.80/370.40
  6. Step 6: Final answer
    x = 438.68

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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.