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Finding the Fourth Proportional to 715.83, 987.06 and 621.74

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Solution

The fourth proportional to 715.83, 987.06 and 621.74 is: 857.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.83 : 987.06 = 621.74 : x
  2. Step 2: Convert to fraction form
    715.83/987.06 = 621.74/x
  3. Step 3: Cross multiply
    715.83x = 987.06 × 621.74
  4. Step 4: Simplify right side
    715.83x = 613,691.58
  5. Step 5: Solve for x
    x = 613,691.58/715.83
  6. Step 6: Final answer
    x = 857.32

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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.