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Finding the Fourth Proportional to 979.79, 1,468.90 and 670.87

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Solution

The fourth proportional to 979.79, 1,468.90 and 670.87 is: 1,005.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.79 : 1,468.90 = 670.87 : x
  2. Step 2: Convert to fraction form
    979.79/1,468.90 = 670.87/x
  3. Step 3: Cross multiply
    979.79x = 1,468.90 × 670.87
  4. Step 4: Simplify right side
    979.79x = 985,440.94
  5. Step 5: Solve for x
    x = 985,440.94/979.79
  6. Step 6: Final answer
    x = 1,005.77

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.