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Finding the Fourth Proportional to 621.02, 857.40 and 555.41

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Solution

The fourth proportional to 621.02, 857.40 and 555.41 is: 766.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.02 : 857.40 = 555.41 : x
  2. Step 2: Convert to fraction form
    621.02/857.40 = 555.41/x
  3. Step 3: Cross multiply
    621.02x = 857.40 × 555.41
  4. Step 4: Simplify right side
    621.02x = 476,208.53
  5. Step 5: Solve for x
    x = 476,208.53/621.02
  6. Step 6: Final answer
    x = 766.82

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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.