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Finding the Fourth Proportional to 612.45, 845.21 and 402.64

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Solution

The fourth proportional to 612.45, 845.21 and 402.64 is: 555.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.45 : 845.21 = 402.64 : x
  2. Step 2: Convert to fraction form
    612.45/845.21 = 402.64/x
  3. Step 3: Cross multiply
    612.45x = 845.21 × 402.64
  4. Step 4: Simplify right side
    612.45x = 340,314.25
  5. Step 5: Solve for x
    x = 340,314.25/612.45
  6. Step 6: Final answer
    x = 555.66

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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.