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Finding the Fourth Proportional to 471.32, 707.66 and 390.68

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Solution

The fourth proportional to 471.32, 707.66 and 390.68 is: 586.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    471.32 : 707.66 = 390.68 : x
  2. Step 2: Convert to fraction form
    471.32/707.66 = 390.68/x
  3. Step 3: Cross multiply
    471.32x = 707.66 × 390.68
  4. Step 4: Simplify right side
    471.32x = 276,468.61
  5. Step 5: Solve for x
    x = 276,468.61/471.32
  6. Step 6: Final answer
    x = 586.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.