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Finding the Fourth Proportional to 1,129.50, 1,558.85 and 663.75

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Solution

The fourth proportional to 1,129.50, 1,558.85 and 663.75 is: 916.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.50 : 1,558.85 = 663.75 : x
  2. Step 2: Convert to fraction form
    1,129.50/1,558.85 = 663.75/x
  3. Step 3: Cross multiply
    1,129.50x = 1,558.85 × 663.75
  4. Step 4: Simplify right side
    1,129.50x = 1,034,683.37
  5. Step 5: Solve for x
    x = 1,034,683.37/1,129.50
  6. Step 6: Final answer
    x = 916.05

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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.