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Finding the Fourth Proportional to 1,039.40, 1,559.26 and 491.88

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Solution

The fourth proportional to 1,039.40, 1,559.26 and 491.88 is: 737.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.40 : 1,559.26 = 491.88 : x
  2. Step 2: Convert to fraction form
    1,039.40/1,559.26 = 491.88/x
  3. Step 3: Cross multiply
    1,039.40x = 1,559.26 × 491.88
  4. Step 4: Simplify right side
    1,039.40x = 766,968.81
  5. Step 5: Solve for x
    x = 766,968.81/1,039.40
  6. Step 6: Final answer
    x = 737.90

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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.