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Finding the Fourth Proportional to 642.18, 955.46 and 640.02

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Solution

The fourth proportional to 642.18, 955.46 and 640.02 is: 952.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.18 : 955.46 = 640.02 : x
  2. Step 2: Convert to fraction form
    642.18/955.46 = 640.02/x
  3. Step 3: Cross multiply
    642.18x = 955.46 × 640.02
  4. Step 4: Simplify right side
    642.18x = 611,510.31
  5. Step 5: Solve for x
    x = 611,510.31/642.18
  6. Step 6: Final answer
    x = 952.24

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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.