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Finding the Fourth Proportional to 1,298.70, 1,792.17 and 709.23

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Solution

The fourth proportional to 1,298.70, 1,792.17 and 709.23 is: 978.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.70 : 1,792.17 = 709.23 : x
  2. Step 2: Convert to fraction form
    1,298.70/1,792.17 = 709.23/x
  3. Step 3: Cross multiply
    1,298.70x = 1,792.17 × 709.23
  4. Step 4: Simplify right side
    1,298.70x = 1,271,060.73
  5. Step 5: Solve for x
    x = 1,271,060.73/1,298.70
  6. Step 6: Final answer
    x = 978.72

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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.