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Finding the Fourth Proportional to 1,126.83, 1,555.23 and 860.84

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Solution

The fourth proportional to 1,126.83, 1,555.23 and 860.84 is: 1,188.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.83 : 1,555.23 = 860.84 : x
  2. Step 2: Convert to fraction form
    1,126.83/1,555.23 = 860.84/x
  3. Step 3: Cross multiply
    1,126.83x = 1,555.23 × 860.84
  4. Step 4: Simplify right side
    1,126.83x = 1,338,796.42
  5. Step 5: Solve for x
    x = 1,338,796.42/1,126.83
  6. Step 6: Final answer
    x = 1,188.11

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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.