Home / 1,122.76-1,549.38-1,089.64

Finding the Fourth Proportional to 1,122.76, 1,549.38 and 1,089.64

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Solution

The fourth proportional to 1,122.76, 1,549.38 and 1,089.64 is: 1,503.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.76 : 1,549.38 = 1,089.64 : x
  2. Step 2: Convert to fraction form
    1,122.76/1,549.38 = 1,089.64/x
  3. Step 3: Cross multiply
    1,122.76x = 1,549.38 × 1,089.64
  4. Step 4: Simplify right side
    1,122.76x = 1,688,266.42
  5. Step 5: Solve for x
    x = 1,688,266.42/1,122.76
  6. Step 6: Final answer
    x = 1,503.68

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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.