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Finding the Fourth Proportional to 986.30, 1,479.45 and 553.40

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Solution

The fourth proportional to 986.30, 1,479.45 and 553.40 is: 830.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.30 : 1,479.45 = 553.40 : x
  2. Step 2: Convert to fraction form
    986.30/1,479.45 = 553.40/x
  3. Step 3: Cross multiply
    986.30x = 1,479.45 × 553.40
  4. Step 4: Simplify right side
    986.30x = 818,727.63
  5. Step 5: Solve for x
    x = 818,727.63/986.30
  6. Step 6: Final answer
    x = 830.10

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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.