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Finding the Fourth Proportional to 621.74, 859.20 and 503.48

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Solution

The fourth proportional to 621.74, 859.20 and 503.48 is: 695.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.74 : 859.20 = 503.48 : x
  2. Step 2: Convert to fraction form
    621.74/859.20 = 503.48/x
  3. Step 3: Cross multiply
    621.74x = 859.20 × 503.48
  4. Step 4: Simplify right side
    621.74x = 432,590.02
  5. Step 5: Solve for x
    x = 432,590.02/621.74
  6. Step 6: Final answer
    x = 695.77

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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.