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Finding the Fourth Proportional to 821.47, 1,133.68 and 448.44

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Solution

The fourth proportional to 821.47, 1,133.68 and 448.44 is: 618.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.47 : 1,133.68 = 448.44 : x
  2. Step 2: Convert to fraction form
    821.47/1,133.68 = 448.44/x
  3. Step 3: Cross multiply
    821.47x = 1,133.68 × 448.44
  4. Step 4: Simplify right side
    821.47x = 508,385.22
  5. Step 5: Solve for x
    x = 508,385.22/821.47
  6. Step 6: Final answer
    x = 618.87

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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.