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Finding the Fourth Proportional to 1,317.63, 1,977.68 and 969.90

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Solution

The fourth proportional to 1,317.63, 1,977.68 and 969.90 is: 1,455.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.63 : 1,977.68 = 969.90 : x
  2. Step 2: Convert to fraction form
    1,317.63/1,977.68 = 969.90/x
  3. Step 3: Cross multiply
    1,317.63x = 1,977.68 × 969.90
  4. Step 4: Simplify right side
    1,317.63x = 1,918,151.83
  5. Step 5: Solve for x
    x = 1,918,151.83/1,317.63
  6. Step 6: Final answer
    x = 1,455.76

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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.