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Finding the Fourth Proportional to 1,058.78, 1,586.80 and 711.60

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Solution

The fourth proportional to 1,058.78, 1,586.80 and 711.60 is: 1,066.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,058.78 : 1,586.80 = 711.60 : x
  2. Step 2: Convert to fraction form
    1,058.78/1,586.80 = 711.60/x
  3. Step 3: Cross multiply
    1,058.78x = 1,586.80 × 711.60
  4. Step 4: Simplify right side
    1,058.78x = 1,129,166.88
  5. Step 5: Solve for x
    x = 1,129,166.88/1,058.78
  6. Step 6: Final answer
    x = 1,066.48

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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.