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Finding the Fourth Proportional to 1,039.64, 1,559.79 and 491.90

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Solution

The fourth proportional to 1,039.64, 1,559.79 and 491.90 is: 738.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.64 : 1,559.79 = 491.90 : x
  2. Step 2: Convert to fraction form
    1,039.64/1,559.79 = 491.90/x
  3. Step 3: Cross multiply
    1,039.64x = 1,559.79 × 491.90
  4. Step 4: Simplify right side
    1,039.64x = 767,252.90
  5. Step 5: Solve for x
    x = 767,252.90/1,039.64
  6. Step 6: Final answer
    x = 738.00

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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.