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Finding the Fourth Proportional to 1,137.87, 1,570.76 and 723.87

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Solution

The fourth proportional to 1,137.87, 1,570.76 and 723.87 is: 999.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.87 : 1,570.76 = 723.87 : x
  2. Step 2: Convert to fraction form
    1,137.87/1,570.76 = 723.87/x
  3. Step 3: Cross multiply
    1,137.87x = 1,570.76 × 723.87
  4. Step 4: Simplify right side
    1,137.87x = 1,137,022.42
  5. Step 5: Solve for x
    x = 1,137,022.42/1,137.87
  6. Step 6: Final answer
    x = 999.26

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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.