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Finding the Fourth Proportional to 508.23, 761.13 and 392.40

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Solution

The fourth proportional to 508.23, 761.13 and 392.40 is: 587.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    508.23 : 761.13 = 392.40 : x
  2. Step 2: Convert to fraction form
    508.23/761.13 = 392.40/x
  3. Step 3: Cross multiply
    508.23x = 761.13 × 392.40
  4. Step 4: Simplify right side
    508.23x = 298,667.41
  5. Step 5: Solve for x
    x = 298,667.41/508.23
  6. Step 6: Final answer
    x = 587.66

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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.