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Finding the Fourth Proportional to 1,138.18, 1,570.66 and 640.92

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Solution

The fourth proportional to 1,138.18, 1,570.66 and 640.92 is: 884.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.18 : 1,570.66 = 640.92 : x
  2. Step 2: Convert to fraction form
    1,138.18/1,570.66 = 640.92/x
  3. Step 3: Cross multiply
    1,138.18x = 1,570.66 × 640.92
  4. Step 4: Simplify right side
    1,138.18x = 1,006,667.41
  5. Step 5: Solve for x
    x = 1,006,667.41/1,138.18
  6. Step 6: Final answer
    x = 884.45

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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.