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Finding the Fourth Proportional to 503.72, 695.16 and 307.20

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Solution

The fourth proportional to 503.72, 695.16 and 307.20 is: 423.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    503.72 : 695.16 = 307.20 : x
  2. Step 2: Convert to fraction form
    503.72/695.16 = 307.20/x
  3. Step 3: Cross multiply
    503.72x = 695.16 × 307.20
  4. Step 4: Simplify right side
    503.72x = 213,553.15
  5. Step 5: Solve for x
    x = 213,553.15/503.72
  6. Step 6: Final answer
    x = 423.95

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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.