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Finding the Fourth Proportional to 1,151.42, 1,589.09 and 709.16

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Solution

The fourth proportional to 1,151.42, 1,589.09 and 709.16 is: 978.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,151.42 : 1,589.09 = 709.16 : x
  2. Step 2: Convert to fraction form
    1,151.42/1,589.09 = 709.16/x
  3. Step 3: Cross multiply
    1,151.42x = 1,589.09 × 709.16
  4. Step 4: Simplify right side
    1,151.42x = 1,126,907.57
  5. Step 5: Solve for x
    x = 1,126,907.57/1,151.42
  6. Step 6: Final answer
    x = 978.72

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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.