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Finding the Fourth Proportional to 798.48, 1,101.18 and 621.48

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Solution

The fourth proportional to 798.48, 1,101.18 and 621.48 is: 857.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.48 : 1,101.18 = 621.48 : x
  2. Step 2: Convert to fraction form
    798.48/1,101.18 = 621.48/x
  3. Step 3: Cross multiply
    798.48x = 1,101.18 × 621.48
  4. Step 4: Simplify right side
    798.48x = 684,361.35
  5. Step 5: Solve for x
    x = 684,361.35/798.48
  6. Step 6: Final answer
    x = 857.08

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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.