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Finding the Fourth Proportional to 986.91, 1,478.34 and 713.55

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Solution

The fourth proportional to 986.91, 1,478.34 and 713.55 is: 1,068.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.91 : 1,478.34 = 713.55 : x
  2. Step 2: Convert to fraction form
    986.91/1,478.34 = 713.55/x
  3. Step 3: Cross multiply
    986.91x = 1,478.34 × 713.55
  4. Step 4: Simplify right side
    986.91x = 1,054,869.51
  5. Step 5: Solve for x
    x = 1,054,869.51/986.91
  6. Step 6: Final answer
    x = 1,068.86

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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.