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Finding the Fourth Proportional to 1,137.99, 1,570.35 and 640.65

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Solution

The fourth proportional to 1,137.99, 1,570.35 and 640.65 is: 884.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.99 : 1,570.35 = 640.65 : x
  2. Step 2: Convert to fraction form
    1,137.99/1,570.35 = 640.65/x
  3. Step 3: Cross multiply
    1,137.99x = 1,570.35 × 640.65
  4. Step 4: Simplify right side
    1,137.99x = 1,006,044.73
  5. Step 5: Solve for x
    x = 1,006,044.73/1,137.99
  6. Step 6: Final answer
    x = 884.05

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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.