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Finding the Fourth Proportional to 404.79, 558.40 and 316.11

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Solution

The fourth proportional to 404.79, 558.40 and 316.11 is: 436.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.79 : 558.40 = 316.11 : x
  2. Step 2: Convert to fraction form
    404.79/558.40 = 316.11/x
  3. Step 3: Cross multiply
    404.79x = 558.40 × 316.11
  4. Step 4: Simplify right side
    404.79x = 176,515.82
  5. Step 5: Solve for x
    x = 176,515.82/404.79
  6. Step 6: Final answer
    x = 436.07

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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.