Home / 1,378.18-2,067.24-647.35

Finding the Fourth Proportional to 1,378.18, 2,067.24 and 647.35

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Solution

The fourth proportional to 1,378.18, 2,067.24 and 647.35 is: 971.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.18 : 2,067.24 = 647.35 : x
  2. Step 2: Convert to fraction form
    1,378.18/2,067.24 = 647.35/x
  3. Step 3: Cross multiply
    1,378.18x = 2,067.24 × 647.35
  4. Step 4: Simplify right side
    1,378.18x = 1,338,227.81
  5. Step 5: Solve for x
    x = 1,338,227.81/1,378.18
  6. Step 6: Final answer
    x = 971.01

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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.