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Finding the Fourth Proportional to 642.36, 959.18 and 563.66

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Solution

The fourth proportional to 642.36, 959.18 and 563.66 is: 841.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.36 : 959.18 = 563.66 : x
  2. Step 2: Convert to fraction form
    642.36/959.18 = 563.66/x
  3. Step 3: Cross multiply
    642.36x = 959.18 × 563.66
  4. Step 4: Simplify right side
    642.36x = 540,651.40
  5. Step 5: Solve for x
    x = 540,651.40/642.36
  6. Step 6: Final answer
    x = 841.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.