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Finding the Fourth Proportional to 1,690.52, 2,332.68 and 991.76

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Solution

The fourth proportional to 1,690.52, 2,332.68 and 991.76 is: 1,368.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,690.52 : 2,332.68 = 991.76 : x
  2. Step 2: Convert to fraction form
    1,690.52/2,332.68 = 991.76/x
  3. Step 3: Cross multiply
    1,690.52x = 2,332.68 × 991.76
  4. Step 4: Simplify right side
    1,690.52x = 2,313,458.72
  5. Step 5: Solve for x
    x = 2,313,458.72/1,690.52
  6. Step 6: Final answer
    x = 1,368.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.