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Finding the Fourth Proportional to 707.85, 976.81 and 393.13

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Solution

The fourth proportional to 707.85, 976.81 and 393.13 is: 542.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.85 : 976.81 = 393.13 : x
  2. Step 2: Convert to fraction form
    707.85/976.81 = 393.13/x
  3. Step 3: Cross multiply
    707.85x = 976.81 × 393.13
  4. Step 4: Simplify right side
    707.85x = 384,008.80
  5. Step 5: Solve for x
    x = 384,008.80/707.85
  6. Step 6: Final answer
    x = 542.50

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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.