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Finding the Fourth Proportional to 1,175.16, 1,621.68 and 709.40

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Solution

The fourth proportional to 1,175.16, 1,621.68 and 709.40 is: 978.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,175.16 : 1,621.68 = 709.40 : x
  2. Step 2: Convert to fraction form
    1,175.16/1,621.68 = 709.40/x
  3. Step 3: Cross multiply
    1,175.16x = 1,621.68 × 709.40
  4. Step 4: Simplify right side
    1,175.16x = 1,150,419.79
  5. Step 5: Solve for x
    x = 1,150,419.79/1,175.16
  6. Step 6: Final answer
    x = 978.95

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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.