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Finding the Fourth Proportional to 1,317.57, 1,975.04 and 623

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Solution

The fourth proportional to 1,317.57, 1,975.04 and 623 is: 933.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.57 : 1,975.04 = 623 : x
  2. Step 2: Convert to fraction form
    1,317.57/1,975.04 = 623/x
  3. Step 3: Cross multiply
    1,317.57x = 1,975.04 × 623
  4. Step 4: Simplify right side
    1,317.57x = 1,230,449.92
  5. Step 5: Solve for x
    x = 1,230,449.92/1,317.57
  6. Step 6: Final answer
    x = 933.88

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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.