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Finding the Fourth Proportional to 1,058.04, 1,458.54 and 861.21

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Solution

The fourth proportional to 1,058.04, 1,458.54 and 861.21 is: 1,187.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,058.04 : 1,458.54 = 861.21 : x
  2. Step 2: Convert to fraction form
    1,058.04/1,458.54 = 861.21/x
  3. Step 3: Cross multiply
    1,058.04x = 1,458.54 × 861.21
  4. Step 4: Simplify right side
    1,058.04x = 1,256,109.23
  5. Step 5: Solve for x
    x = 1,256,109.23/1,058.04
  6. Step 6: Final answer
    x = 1,187.20

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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.