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Finding the Fourth Proportional to 1,013.91, 1,398.96 and 699.45

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Solution

The fourth proportional to 1,013.91, 1,398.96 and 699.45 is: 965.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.91 : 1,398.96 = 699.45 : x
  2. Step 2: Convert to fraction form
    1,013.91/1,398.96 = 699.45/x
  3. Step 3: Cross multiply
    1,013.91x = 1,398.96 × 699.45
  4. Step 4: Simplify right side
    1,013.91x = 978,502.57
  5. Step 5: Solve for x
    x = 978,502.57/1,013.91
  6. Step 6: Final answer
    x = 965.08

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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.