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Finding the Fourth Proportional to 921, 1,272 and 625.74

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Solution

The fourth proportional to 921, 1,272 and 625.74 is: 864.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    921 : 1,272 = 625.74 : x
  2. Step 2: Convert to fraction form
    921/1,272 = 625.74/x
  3. Step 3: Cross multiply
    921x = 1,272 × 625.74
  4. Step 4: Simplify right side
    921x = 795,941.28
  5. Step 5: Solve for x
    x = 795,941.28/921
  6. Step 6: Final answer
    x = 864.21

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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.