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Finding the Fourth Proportional to 1,298.87, 1,792.43 and 709.41

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Solution

The fourth proportional to 1,298.87, 1,792.43 and 709.41 is: 978.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.87 : 1,792.43 = 709.41 : x
  2. Step 2: Convert to fraction form
    1,298.87/1,792.43 = 709.41/x
  3. Step 3: Cross multiply
    1,298.87x = 1,792.43 × 709.41
  4. Step 4: Simplify right side
    1,298.87x = 1,271,564.22
  5. Step 5: Solve for x
    x = 1,271,564.22/1,298.87
  6. Step 6: Final answer
    x = 978.98

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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.