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Finding the Fourth Proportional to 642.77, 959.11 and 603.59

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Solution

The fourth proportional to 642.77, 959.11 and 603.59 is: 900.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.77 : 959.11 = 603.59 : x
  2. Step 2: Convert to fraction form
    642.77/959.11 = 603.59/x
  3. Step 3: Cross multiply
    642.77x = 959.11 × 603.59
  4. Step 4: Simplify right side
    642.77x = 578,909.20
  5. Step 5: Solve for x
    x = 578,909.20/642.77
  6. Step 6: Final answer
    x = 900.65

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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.