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Finding the Fourth Proportional to 767.18, 1,058.70 and 417.87

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Solution

The fourth proportional to 767.18, 1,058.70 and 417.87 is: 576.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.18 : 1,058.70 = 417.87 : x
  2. Step 2: Convert to fraction form
    767.18/1,058.70 = 417.87/x
  3. Step 3: Cross multiply
    767.18x = 1,058.70 × 417.87
  4. Step 4: Simplify right side
    767.18x = 442,398.97
  5. Step 5: Solve for x
    x = 442,398.97/767.18
  6. Step 6: Final answer
    x = 576.66

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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.