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Finding the Fourth Proportional to 711.45, 980.74 and 500.94

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Solution

The fourth proportional to 711.45, 980.74 and 500.94 is: 690.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.45 : 980.74 = 500.94 : x
  2. Step 2: Convert to fraction form
    711.45/980.74 = 500.94/x
  3. Step 3: Cross multiply
    711.45x = 980.74 × 500.94
  4. Step 4: Simplify right side
    711.45x = 491,291.90
  5. Step 5: Solve for x
    x = 491,291.90/711.45
  6. Step 6: Final answer
    x = 690.55

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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.