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Finding the Fourth Proportional to 642.80, 964.20 and 594.20

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Solution

The fourth proportional to 642.80, 964.20 and 594.20 is: 891.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.80 : 964.20 = 594.20 : x
  2. Step 2: Convert to fraction form
    642.80/964.20 = 594.20/x
  3. Step 3: Cross multiply
    642.80x = 964.20 × 594.20
  4. Step 4: Simplify right side
    642.80x = 572,927.64
  5. Step 5: Solve for x
    x = 572,927.64/642.80
  6. Step 6: Final answer
    x = 891.30

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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.