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Finding the Fourth Proportional to 1,317.16, 1,972.86 and 931.24

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Solution

The fourth proportional to 1,317.16, 1,972.86 and 931.24 is: 1,394.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.16 : 1,972.86 = 931.24 : x
  2. Step 2: Convert to fraction form
    1,317.16/1,972.86 = 931.24/x
  3. Step 3: Cross multiply
    1,317.16x = 1,972.86 × 931.24
  4. Step 4: Simplify right side
    1,317.16x = 1,837,206.15
  5. Step 5: Solve for x
    x = 1,837,206.15/1,317.16
  6. Step 6: Final answer
    x = 1,394.82

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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.