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Finding the Fourth Proportional to 1,138.02, 1,570.26 and 640.65

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Solution

The fourth proportional to 1,138.02, 1,570.26 and 640.65 is: 883.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.02 : 1,570.26 = 640.65 : x
  2. Step 2: Convert to fraction form
    1,138.02/1,570.26 = 640.65/x
  3. Step 3: Cross multiply
    1,138.02x = 1,570.26 × 640.65
  4. Step 4: Simplify right side
    1,138.02x = 1,005,987.07
  5. Step 5: Solve for x
    x = 1,005,987.07/1,138.02
  6. Step 6: Final answer
    x = 883.98

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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.