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Finding the Fourth Proportional to 612.79, 845.31 and 403

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Solution

The fourth proportional to 612.79, 845.31 and 403 is: 555.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.79 : 845.31 = 403 : x
  2. Step 2: Convert to fraction form
    612.79/845.31 = 403/x
  3. Step 3: Cross multiply
    612.79x = 845.31 × 403
  4. Step 4: Simplify right side
    612.79x = 340,659.93
  5. Step 5: Solve for x
    x = 340,659.93/612.79
  6. Step 6: Final answer
    x = 555.92

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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.