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Finding the Fourth Proportional to 675.36, 932.40 and 478.80

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Solution

The fourth proportional to 675.36, 932.40 and 478.80 is: 661.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.36 : 932.40 = 478.80 : x
  2. Step 2: Convert to fraction form
    675.36/932.40 = 478.80/x
  3. Step 3: Cross multiply
    675.36x = 932.40 × 478.80
  4. Step 4: Simplify right side
    675.36x = 446,433.12
  5. Step 5: Solve for x
    x = 446,433.12/675.36
  6. Step 6: Final answer
    x = 661.03

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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.