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Finding the Fourth Proportional to 1,137.91, 1,570.17 and 783.94

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Solution

The fourth proportional to 1,137.91, 1,570.17 and 783.94 is: 1,081.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.91 : 1,570.17 = 783.94 : x
  2. Step 2: Convert to fraction form
    1,137.91/1,570.17 = 783.94/x
  3. Step 3: Cross multiply
    1,137.91x = 1,570.17 × 783.94
  4. Step 4: Simplify right side
    1,137.91x = 1,230,919.07
  5. Step 5: Solve for x
    x = 1,230,919.07/1,137.91
  6. Step 6: Final answer
    x = 1,081.74

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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.