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Finding the Fourth Proportional to 1,138.08, 1,570.56 and 724

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Solution

The fourth proportional to 1,138.08, 1,570.56 and 724 is: 999.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.08 : 1,570.56 = 724 : x
  2. Step 2: Convert to fraction form
    1,138.08/1,570.56 = 724/x
  3. Step 3: Cross multiply
    1,138.08x = 1,570.56 × 724
  4. Step 4: Simplify right side
    1,138.08x = 1,137,085.44
  5. Step 5: Solve for x
    x = 1,137,085.44/1,138.08
  6. Step 6: Final answer
    x = 999.13

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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.