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Finding the Fourth Proportional to 478.89, 661.48 and 369.72

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Solution

The fourth proportional to 478.89, 661.48 and 369.72 is: 510.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.89 : 661.48 = 369.72 : x
  2. Step 2: Convert to fraction form
    478.89/661.48 = 369.72/x
  3. Step 3: Cross multiply
    478.89x = 661.48 × 369.72
  4. Step 4: Simplify right side
    478.89x = 244,561.46
  5. Step 5: Solve for x
    x = 244,561.46/478.89
  6. Step 6: Final answer
    x = 510.68

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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.