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Finding the Fourth Proportional to 1,021.02, 1,408.43 and 627.77

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Solution

The fourth proportional to 1,021.02, 1,408.43 and 627.77 is: 865.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.02 : 1,408.43 = 627.77 : x
  2. Step 2: Convert to fraction form
    1,021.02/1,408.43 = 627.77/x
  3. Step 3: Cross multiply
    1,021.02x = 1,408.43 × 627.77
  4. Step 4: Simplify right side
    1,021.02x = 884,159.92
  5. Step 5: Solve for x
    x = 884,159.92/1,021.02
  6. Step 6: Final answer
    x = 865.96

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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.