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Finding the Fourth Proportional to 1,129.58, 1,558.79 and 618.55

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Solution

The fourth proportional to 1,129.58, 1,558.79 and 618.55 is: 853.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.58 : 1,558.79 = 618.55 : x
  2. Step 2: Convert to fraction form
    1,129.58/1,558.79 = 618.55/x
  3. Step 3: Cross multiply
    1,129.58x = 1,558.79 × 618.55
  4. Step 4: Simplify right side
    1,129.58x = 964,187.20
  5. Step 5: Solve for x
    x = 964,187.20/1,129.58
  6. Step 6: Final answer
    x = 853.58

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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.