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Finding the Fourth Proportional to 1,689.80, 2,332.17 and 981.77

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Solution

The fourth proportional to 1,689.80, 2,332.17 and 981.77 is: 1,354.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.80 : 2,332.17 = 981.77 : x
  2. Step 2: Convert to fraction form
    1,689.80/2,332.17 = 981.77/x
  3. Step 3: Cross multiply
    1,689.80x = 2,332.17 × 981.77
  4. Step 4: Simplify right side
    1,689.80x = 2,289,642.88
  5. Step 5: Solve for x
    x = 2,289,642.88/1,689.80
  6. Step 6: Final answer
    x = 1,354.98

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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.