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Finding the Fourth Proportional to 607.91, 909.95 and 399.81

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Solution

The fourth proportional to 607.91, 909.95 and 399.81 is: 598.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    607.91 : 909.95 = 399.81 : x
  2. Step 2: Convert to fraction form
    607.91/909.95 = 399.81/x
  3. Step 3: Cross multiply
    607.91x = 909.95 × 399.81
  4. Step 4: Simplify right side
    607.91x = 363,805.11
  5. Step 5: Solve for x
    x = 363,805.11/607.91
  6. Step 6: Final answer
    x = 598.45

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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.