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Finding the Fourth Proportional to 504.20, 695.68 and 317.76

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Solution

The fourth proportional to 504.20, 695.68 and 317.76 is: 438.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    504.20 : 695.68 = 317.76 : x
  2. Step 2: Convert to fraction form
    504.20/695.68 = 317.76/x
  3. Step 3: Cross multiply
    504.20x = 695.68 × 317.76
  4. Step 4: Simplify right side
    504.20x = 221,059.28
  5. Step 5: Solve for x
    x = 221,059.28/504.20
  6. Step 6: Final answer
    x = 438.44

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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.