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Finding the Fourth Proportional to 920.70, 1,378.89 and 713.61

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Solution

The fourth proportional to 920.70, 1,378.89 and 713.61 is: 1,068.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.70 : 1,378.89 = 713.61 : x
  2. Step 2: Convert to fraction form
    920.70/1,378.89 = 713.61/x
  3. Step 3: Cross multiply
    920.70x = 1,378.89 × 713.61
  4. Step 4: Simplify right side
    920.70x = 983,989.69
  5. Step 5: Solve for x
    x = 983,989.69/920.70
  6. Step 6: Final answer
    x = 1,068.74

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Why These Related Problems?

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