Home / 1,660.45-2,491.40-686.77

Finding the Fourth Proportional to 1,660.45, 2,491.40 and 686.77

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Solution

The fourth proportional to 1,660.45, 2,491.40 and 686.77 is: 1,030.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,660.45 : 2,491.40 = 686.77 : x
  2. Step 2: Convert to fraction form
    1,660.45/2,491.40 = 686.77/x
  3. Step 3: Cross multiply
    1,660.45x = 2,491.40 × 686.77
  4. Step 4: Simplify right side
    1,660.45x = 1,711,018.78
  5. Step 5: Solve for x
    x = 1,711,018.78/1,660.45
  6. Step 6: Final answer
    x = 1,030.45

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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.