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Finding the Fourth Proportional to 986.72, 1,491.29 and 969.72

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Solution

The fourth proportional to 986.72, 1,491.29 and 969.72 is: 1,465.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.72 : 1,491.29 = 969.72 : x
  2. Step 2: Convert to fraction form
    986.72/1,491.29 = 969.72/x
  3. Step 3: Cross multiply
    986.72x = 1,491.29 × 969.72
  4. Step 4: Simplify right side
    986.72x = 1,446,133.74
  5. Step 5: Solve for x
    x = 1,446,133.74/986.72
  6. Step 6: Final answer
    x = 1,465.60

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.