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Finding the Fourth Proportional to 1,152.19, 1,589.57 and 709.32

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Solution

The fourth proportional to 1,152.19, 1,589.57 and 709.32 is: 978.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,152.19 : 1,589.57 = 709.32 : x
  2. Step 2: Convert to fraction form
    1,152.19/1,589.57 = 709.32/x
  3. Step 3: Cross multiply
    1,152.19x = 1,589.57 × 709.32
  4. Step 4: Simplify right side
    1,152.19x = 1,127,515.57
  5. Step 5: Solve for x
    x = 1,127,515.57/1,152.19
  6. Step 6: Final answer
    x = 978.59

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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.