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Finding the Fourth Proportional to 643.01, 886.70 and 559.94

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Solution

The fourth proportional to 643.01, 886.70 and 559.94 is: 772.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.01 : 886.70 = 559.94 : x
  2. Step 2: Convert to fraction form
    643.01/886.70 = 559.94/x
  3. Step 3: Cross multiply
    643.01x = 886.70 × 559.94
  4. Step 4: Simplify right side
    643.01x = 496,495.76
  5. Step 5: Solve for x
    x = 496,495.76/643.01
  6. Step 6: Final answer
    x = 772.15

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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.