Home / 1,220.20-1,688.25-1,065.40

Finding the Fourth Proportional to 1,220.20, 1,688.25 and 1,065.40

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Solution

The fourth proportional to 1,220.20, 1,688.25 and 1,065.40 is: 1,474.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.20 : 1,688.25 = 1,065.40 : x
  2. Step 2: Convert to fraction form
    1,220.20/1,688.25 = 1,065.40/x
  3. Step 3: Cross multiply
    1,220.20x = 1,688.25 × 1,065.40
  4. Step 4: Simplify right side
    1,220.20x = 1,798,661.55
  5. Step 5: Solve for x
    x = 1,798,661.55/1,220.20
  6. Step 6: Final answer
    x = 1,474.07

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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.