Home / 1,228.90-1,695.80-917.86

Finding the Fourth Proportional to 1,228.90, 1,695.80 and 917.86

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Solution

The fourth proportional to 1,228.90, 1,695.80 and 917.86 is: 1,266.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.90 : 1,695.80 = 917.86 : x
  2. Step 2: Convert to fraction form
    1,228.90/1,695.80 = 917.86/x
  3. Step 3: Cross multiply
    1,228.90x = 1,695.80 × 917.86
  4. Step 4: Simplify right side
    1,228.90x = 1,556,506.99
  5. Step 5: Solve for x
    x = 1,556,506.99/1,228.90
  6. Step 6: Final answer
    x = 1,266.59

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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.