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Finding the Fourth Proportional to 864.21, 1,295.65 and 425.32

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Solution

The fourth proportional to 864.21, 1,295.65 and 425.32 is: 637.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.21 : 1,295.65 = 425.32 : x
  2. Step 2: Convert to fraction form
    864.21/1,295.65 = 425.32/x
  3. Step 3: Cross multiply
    864.21x = 1,295.65 × 425.32
  4. Step 4: Simplify right side
    864.21x = 551,065.86
  5. Step 5: Solve for x
    x = 551,065.86/864.21
  6. Step 6: Final answer
    x = 637.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.