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Finding the Fourth Proportional to 1,148.80, 1,718.94 and 686.82

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Solution

The fourth proportional to 1,148.80, 1,718.94 and 686.82 is: 1,027.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,148.80 : 1,718.94 = 686.82 : x
  2. Step 2: Convert to fraction form
    1,148.80/1,718.94 = 686.82/x
  3. Step 3: Cross multiply
    1,148.80x = 1,718.94 × 686.82
  4. Step 4: Simplify right side
    1,148.80x = 1,180,602.37
  5. Step 5: Solve for x
    x = 1,180,602.37/1,148.80
  6. Step 6: Final answer
    x = 1,027.68

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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.