Home / 1,220.79-1,685.49-1,089.57

Finding the Fourth Proportional to 1,220.79, 1,685.49 and 1,089.57

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Solution

The fourth proportional to 1,220.79, 1,685.49 and 1,089.57 is: 1,504.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.79 : 1,685.49 = 1,089.57 : x
  2. Step 2: Convert to fraction form
    1,220.79/1,685.49 = 1,089.57/x
  3. Step 3: Cross multiply
    1,220.79x = 1,685.49 × 1,089.57
  4. Step 4: Simplify right side
    1,220.79x = 1,836,459.34
  5. Step 5: Solve for x
    x = 1,836,459.34/1,220.79
  6. Step 6: Final answer
    x = 1,504.32

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Double scale
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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.