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Finding the Fourth Proportional to 704.80, 972.63 and 390.09

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Solution

The fourth proportional to 704.80, 972.63 and 390.09 is: 538.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.80 : 972.63 = 390.09 : x
  2. Step 2: Convert to fraction form
    704.80/972.63 = 390.09/x
  3. Step 3: Cross multiply
    704.80x = 972.63 × 390.09
  4. Step 4: Simplify right side
    704.80x = 379,411.02
  5. Step 5: Solve for x
    x = 379,411.02/704.80
  6. Step 6: Final answer
    x = 538.32

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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.