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Finding the Fourth Proportional to 715.55, 986.78 and 466.79

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Solution

The fourth proportional to 715.55, 986.78 and 466.79 is: 643.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.55 : 986.78 = 466.79 : x
  2. Step 2: Convert to fraction form
    715.55/986.78 = 466.79/x
  3. Step 3: Cross multiply
    715.55x = 986.78 × 466.79
  4. Step 4: Simplify right side
    715.55x = 460,622.67
  5. Step 5: Solve for x
    x = 460,622.67/715.55
  6. Step 6: Final answer
    x = 643.73

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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.