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Finding the Fourth Proportional to 642.88, 959.26 and 603.69

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Solution

The fourth proportional to 642.88, 959.26 and 603.69 is: 900.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.88 : 959.26 = 603.69 : x
  2. Step 2: Convert to fraction form
    642.88/959.26 = 603.69/x
  3. Step 3: Cross multiply
    642.88x = 959.26 × 603.69
  4. Step 4: Simplify right side
    642.88x = 579,095.67
  5. Step 5: Solve for x
    x = 579,095.67/642.88
  6. Step 6: Final answer
    x = 900.78

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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.