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Finding the Fourth Proportional to 642.80, 964.19 and 356.06

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Solution

The fourth proportional to 642.80, 964.19 and 356.06 is: 534.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.80 : 964.19 = 356.06 : x
  2. Step 2: Convert to fraction form
    642.80/964.19 = 356.06/x
  3. Step 3: Cross multiply
    642.80x = 964.19 × 356.06
  4. Step 4: Simplify right side
    642.80x = 343,302.89
  5. Step 5: Solve for x
    x = 343,302.89/642.80
  6. Step 6: Final answer
    x = 534.08

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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.