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Finding the Fourth Proportional to 1,021.27, 1,408.95 and 722.95

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Solution

The fourth proportional to 1,021.27, 1,408.95 and 722.95 is: 997.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.27 : 1,408.95 = 722.95 : x
  2. Step 2: Convert to fraction form
    1,021.27/1,408.95 = 722.95/x
  3. Step 3: Cross multiply
    1,021.27x = 1,408.95 × 722.95
  4. Step 4: Simplify right side
    1,021.27x = 1,018,600.40
  5. Step 5: Solve for x
    x = 1,018,600.40/1,021.27
  6. Step 6: Final answer
    x = 997.39

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1.5x scale

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.