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Finding the Fourth Proportional to 986.55, 1,479.83 and 715.20

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Solution

The fourth proportional to 986.55, 1,479.83 and 715.20 is: 1,072.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.55 : 1,479.83 = 715.20 : x
  2. Step 2: Convert to fraction form
    986.55/1,479.83 = 715.20/x
  3. Step 3: Cross multiply
    986.55x = 1,479.83 × 715.20
  4. Step 4: Simplify right side
    986.55x = 1,058,370.84
  5. Step 5: Solve for x
    x = 1,058,370.84/986.55
  6. Step 6: Final answer
    x = 1,072.80

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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.