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Finding the Fourth Proportional to 672.59, 1,009.74 and 411.95

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Solution

The fourth proportional to 672.59, 1,009.74 and 411.95 is: 618.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.59 : 1,009.74 = 411.95 : x
  2. Step 2: Convert to fraction form
    672.59/1,009.74 = 411.95/x
  3. Step 3: Cross multiply
    672.59x = 1,009.74 × 411.95
  4. Step 4: Simplify right side
    672.59x = 415,962.39
  5. Step 5: Solve for x
    x = 415,962.39/672.59
  6. Step 6: Final answer
    x = 618.45

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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.