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Finding the Fourth Proportional to 659.32, 909.64 and 393.84

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Solution

The fourth proportional to 659.32, 909.64 and 393.84 is: 543.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.32 : 909.64 = 393.84 : x
  2. Step 2: Convert to fraction form
    659.32/909.64 = 393.84/x
  3. Step 3: Cross multiply
    659.32x = 909.64 × 393.84
  4. Step 4: Simplify right side
    659.32x = 358,253.91
  5. Step 5: Solve for x
    x = 358,253.91/659.32
  6. Step 6: Final answer
    x = 543.37

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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.