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Finding the Fourth Proportional to 743.05, 1,025.47 and 411.51

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Solution

The fourth proportional to 743.05, 1,025.47 and 411.51 is: 567.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.05 : 1,025.47 = 411.51 : x
  2. Step 2: Convert to fraction form
    743.05/1,025.47 = 411.51/x
  3. Step 3: Cross multiply
    743.05x = 1,025.47 × 411.51
  4. Step 4: Simplify right side
    743.05x = 421,988.59
  5. Step 5: Solve for x
    x = 421,988.59/743.05
  6. Step 6: Final answer
    x = 567.91

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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.