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Finding the Fourth Proportional to 404.40, 557.82 and 317.28

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Solution

The fourth proportional to 404.40, 557.82 and 317.28 is: 437.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.40 : 557.82 = 317.28 : x
  2. Step 2: Convert to fraction form
    404.40/557.82 = 317.28/x
  3. Step 3: Cross multiply
    404.40x = 557.82 × 317.28
  4. Step 4: Simplify right side
    404.40x = 176,985.13
  5. Step 5: Solve for x
    x = 176,985.13/404.40
  6. Step 6: Final answer
    x = 437.65

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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.