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Finding the Fourth Proportional to 1,138.77, 1,570.59 and 765.50

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Solution

The fourth proportional to 1,138.77, 1,570.59 and 765.50 is: 1,055.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.77 : 1,570.59 = 765.50 : x
  2. Step 2: Convert to fraction form
    1,138.77/1,570.59 = 765.50/x
  3. Step 3: Cross multiply
    1,138.77x = 1,570.59 × 765.50
  4. Step 4: Simplify right side
    1,138.77x = 1,202,278.79
  5. Step 5: Solve for x
    x = 1,202,278.79/1,138.77
  6. Step 6: Final answer
    x = 1,055.77

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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.