Home / 1,117.32-1,675.40-386.68

Finding the Fourth Proportional to 1,117.32, 1,675.40 and 386.68

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Solution

The fourth proportional to 1,117.32, 1,675.40 and 386.68 is: 579.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.32 : 1,675.40 = 386.68 : x
  2. Step 2: Convert to fraction form
    1,117.32/1,675.40 = 386.68/x
  3. Step 3: Cross multiply
    1,117.32x = 1,675.40 × 386.68
  4. Step 4: Simplify right side
    1,117.32x = 647,843.67
  5. Step 5: Solve for x
    x = 647,843.67/1,117.32
  6. Step 6: Final answer
    x = 579.82

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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.