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Finding the Fourth Proportional to 1,266.20, 1,898.40 and 485.90

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Solution

The fourth proportional to 1,266.20, 1,898.40 and 485.90 is: 728.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,266.20 : 1,898.40 = 485.90 : x
  2. Step 2: Convert to fraction form
    1,266.20/1,898.40 = 485.90/x
  3. Step 3: Cross multiply
    1,266.20x = 1,898.40 × 485.90
  4. Step 4: Simplify right side
    1,266.20x = 922,432.56
  5. Step 5: Solve for x
    x = 922,432.56/1,266.20
  6. Step 6: Final answer
    x = 728.50

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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.