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Finding the Fourth Proportional to 1,138.19, 1,570.71 and 640.80

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Solution

The fourth proportional to 1,138.19, 1,570.71 and 640.80 is: 884.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.19 : 1,570.71 = 640.80 : x
  2. Step 2: Convert to fraction form
    1,138.19/1,570.71 = 640.80/x
  3. Step 3: Cross multiply
    1,138.19x = 1,570.71 × 640.80
  4. Step 4: Simplify right side
    1,138.19x = 1,006,510.97
  5. Step 5: Solve for x
    x = 1,006,510.97/1,138.19
  6. Step 6: Final answer
    x = 884.31

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1.5x scale

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.