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Finding the Fourth Proportional to 643.20, 887.93 and 503.07

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Solution

The fourth proportional to 643.20, 887.93 and 503.07 is: 694.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.20 : 887.93 = 503.07 : x
  2. Step 2: Convert to fraction form
    643.20/887.93 = 503.07/x
  3. Step 3: Cross multiply
    643.20x = 887.93 × 503.07
  4. Step 4: Simplify right side
    643.20x = 446,690.95
  5. Step 5: Solve for x
    x = 446,690.95/643.20
  6. Step 6: Final answer
    x = 694.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.