Home / 1,677.40-2,315.10-979.12

Finding the Fourth Proportional to 1,677.40, 2,315.10 and 979.12

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Solution

The fourth proportional to 1,677.40, 2,315.10 and 979.12 is: 1,351.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,677.40 : 2,315.10 = 979.12 : x
  2. Step 2: Convert to fraction form
    1,677.40/2,315.10 = 979.12/x
  3. Step 3: Cross multiply
    1,677.40x = 2,315.10 × 979.12
  4. Step 4: Simplify right side
    1,677.40x = 2,266,760.71
  5. Step 5: Solve for x
    x = 2,266,760.71/1,677.40
  6. Step 6: Final answer
    x = 1,351.35

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1.5x scale

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.