Home / 1,217.28-1,675.52-917.76

Finding the Fourth Proportional to 1,217.28, 1,675.52 and 917.76

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Solution

The fourth proportional to 1,217.28, 1,675.52 and 917.76 is: 1,263.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.28 : 1,675.52 = 917.76 : x
  2. Step 2: Convert to fraction form
    1,217.28/1,675.52 = 917.76/x
  3. Step 3: Cross multiply
    1,217.28x = 1,675.52 × 917.76
  4. Step 4: Simplify right side
    1,217.28x = 1,537,725.24
  5. Step 5: Solve for x
    x = 1,537,725.24/1,217.28
  6. Step 6: Final answer
    x = 1,263.25

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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.