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Finding the Fourth Proportional to 986.16, 1,478.16 and 553.08

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Solution

The fourth proportional to 986.16, 1,478.16 and 553.08 is: 829.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.16 : 1,478.16 = 553.08 : x
  2. Step 2: Convert to fraction form
    986.16/1,478.16 = 553.08/x
  3. Step 3: Cross multiply
    986.16x = 1,478.16 × 553.08
  4. Step 4: Simplify right side
    986.16x = 817,540.73
  5. Step 5: Solve for x
    x = 817,540.73/986.16
  6. Step 6: Final answer
    x = 829.01

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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.