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Finding the Fourth Proportional to 994.77, 1,372.14 and 621.63

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Solution

The fourth proportional to 994.77, 1,372.14 and 621.63 is: 857.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.77 : 1,372.14 = 621.63 : x
  2. Step 2: Convert to fraction form
    994.77/1,372.14 = 621.63/x
  3. Step 3: Cross multiply
    994.77x = 1,372.14 × 621.63
  4. Step 4: Simplify right side
    994.77x = 852,963.39
  5. Step 5: Solve for x
    x = 852,963.39/994.77
  6. Step 6: Final answer
    x = 857.45

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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.