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Finding the Fourth Proportional to 642.75, 959.08 and 603.57

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Solution

The fourth proportional to 642.75, 959.08 and 603.57 is: 900.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.75 : 959.08 = 603.57 : x
  2. Step 2: Convert to fraction form
    642.75/959.08 = 603.57/x
  3. Step 3: Cross multiply
    642.75x = 959.08 × 603.57
  4. Step 4: Simplify right side
    642.75x = 578,871.92
  5. Step 5: Solve for x
    x = 578,871.92/642.75
  6. Step 6: Final answer
    x = 900.62

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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.