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Finding the Fourth Proportional to 1,058.82, 1,579.76 and 921.66

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Solution

The fourth proportional to 1,058.82, 1,579.76 and 921.66 is: 1,375.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,058.82 : 1,579.76 = 921.66 : x
  2. Step 2: Convert to fraction form
    1,058.82/1,579.76 = 921.66/x
  3. Step 3: Cross multiply
    1,058.82x = 1,579.76 × 921.66
  4. Step 4: Simplify right side
    1,058.82x = 1,455,996.99
  5. Step 5: Solve for x
    x = 1,455,996.99/1,058.82
  6. Step 6: Final answer
    x = 1,375.11

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.