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Finding the Fourth Proportional to 1,486.64, 2,230.20 and 621.20

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Solution

The fourth proportional to 1,486.64, 2,230.20 and 621.20 is: 931.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,486.64 : 2,230.20 = 621.20 : x
  2. Step 2: Convert to fraction form
    1,486.64/2,230.20 = 621.20/x
  3. Step 3: Cross multiply
    1,486.64x = 2,230.20 × 621.20
  4. Step 4: Simplify right side
    1,486.64x = 1,385,400.24
  5. Step 5: Solve for x
    x = 1,385,400.24/1,486.64
  6. Step 6: Final answer
    x = 931.90

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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.