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Finding the Fourth Proportional to 704.95, 972.82 and 390.23

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Solution

The fourth proportional to 704.95, 972.82 and 390.23 is: 538.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.95 : 972.82 = 390.23 : x
  2. Step 2: Convert to fraction form
    704.95/972.82 = 390.23/x
  3. Step 3: Cross multiply
    704.95x = 972.82 × 390.23
  4. Step 4: Simplify right side
    704.95x = 379,622.82
  5. Step 5: Solve for x
    x = 379,622.82/704.95
  6. Step 6: Final answer
    x = 538.51

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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.