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Finding the Fourth Proportional to 504.30, 695.70 and 317.70

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Solution

The fourth proportional to 504.30, 695.70 and 317.70 is: 438.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    504.30 : 695.70 = 317.70 : x
  2. Step 2: Convert to fraction form
    504.30/695.70 = 317.70/x
  3. Step 3: Cross multiply
    504.30x = 695.70 × 317.70
  4. Step 4: Simplify right side
    504.30x = 221,023.89
  5. Step 5: Solve for x
    x = 221,023.89/504.30
  6. Step 6: Final answer
    x = 438.28

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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.