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Finding the Fourth Proportional to 647.88, 891.72 and 554.28

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Solution

The fourth proportional to 647.88, 891.72 and 554.28 is: 762.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.88 : 891.72 = 554.28 : x
  2. Step 2: Convert to fraction form
    647.88/891.72 = 554.28/x
  3. Step 3: Cross multiply
    647.88x = 891.72 × 554.28
  4. Step 4: Simplify right side
    647.88x = 494,262.56
  5. Step 5: Solve for x
    x = 494,262.56/647.88
  6. Step 6: Final answer
    x = 762.89

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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.