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Finding the Fourth Proportional to 1,570.70, 2,357.13 and 840.80

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Solution

The fourth proportional to 1,570.70, 2,357.13 and 840.80 is: 1,261.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,570.70 : 2,357.13 = 840.80 : x
  2. Step 2: Convert to fraction form
    1,570.70/2,357.13 = 840.80/x
  3. Step 3: Cross multiply
    1,570.70x = 2,357.13 × 840.80
  4. Step 4: Simplify right side
    1,570.70x = 1,981,874.90
  5. Step 5: Solve for x
    x = 1,981,874.90/1,570.70
  6. Step 6: Final answer
    x = 1,261.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.