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Finding the Fourth Proportional to 642.51, 887.09 and 467.55

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Solution

The fourth proportional to 642.51, 887.09 and 467.55 is: 645.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.51 : 887.09 = 467.55 : x
  2. Step 2: Convert to fraction form
    642.51/887.09 = 467.55/x
  3. Step 3: Cross multiply
    642.51x = 887.09 × 467.55
  4. Step 4: Simplify right side
    642.51x = 414,756.59
  5. Step 5: Solve for x
    x = 414,756.59/642.51
  6. Step 6: Final answer
    x = 645.53

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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.