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Finding the Fourth Proportional to 1,136.25, 1,567.90 and 638.79

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Solution

The fourth proportional to 1,136.25, 1,567.90 and 638.79 is: 881.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.25 : 1,567.90 = 638.79 : x
  2. Step 2: Convert to fraction form
    1,136.25/1,567.90 = 638.79/x
  3. Step 3: Cross multiply
    1,136.25x = 1,567.90 × 638.79
  4. Step 4: Simplify right side
    1,136.25x = 1,001,558.84
  5. Step 5: Solve for x
    x = 1,001,558.84/1,136.25
  6. Step 6: Final answer
    x = 881.46

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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.