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Finding the Fourth Proportional to 508.12, 700.14 and 391.48

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Solution

The fourth proportional to 508.12, 700.14 and 391.48 is: 539.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    508.12 : 700.14 = 391.48 : x
  2. Step 2: Convert to fraction form
    508.12/700.14 = 391.48/x
  3. Step 3: Cross multiply
    508.12x = 700.14 × 391.48
  4. Step 4: Simplify right side
    508.12x = 274,090.81
  5. Step 5: Solve for x
    x = 274,090.81/508.12
  6. Step 6: Final answer
    x = 539.42

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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.