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Finding the Fourth Proportional to 1,058.21, 1,587.16 and 442.07

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Solution

The fourth proportional to 1,058.21, 1,587.16 and 442.07 is: 663.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,058.21 : 1,587.16 = 442.07 : x
  2. Step 2: Convert to fraction form
    1,058.21/1,587.16 = 442.07/x
  3. Step 3: Cross multiply
    1,058.21x = 1,587.16 × 442.07
  4. Step 4: Simplify right side
    1,058.21x = 701,635.82
  5. Step 5: Solve for x
    x = 701,635.82/1,058.21
  6. Step 6: Final answer
    x = 663.04

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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.