Home / 1,217.45-1,680.17-918.17

Finding the Fourth Proportional to 1,217.45, 1,680.17 and 918.17

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Solution

The fourth proportional to 1,217.45, 1,680.17 and 918.17 is: 1,267.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.45 : 1,680.17 = 918.17 : x
  2. Step 2: Convert to fraction form
    1,217.45/1,680.17 = 918.17/x
  3. Step 3: Cross multiply
    1,217.45x = 1,680.17 × 918.17
  4. Step 4: Simplify right side
    1,217.45x = 1,542,681.62
  5. Step 5: Solve for x
    x = 1,542,681.62/1,217.45
  6. Step 6: Final answer
    x = 1,267.14

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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.