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Finding the Fourth Proportional to 1,355.38, 2,031.40 and 770.87

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Solution

The fourth proportional to 1,355.38, 2,031.40 and 770.87 is: 1,155.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.38 : 2,031.40 = 770.87 : x
  2. Step 2: Convert to fraction form
    1,355.38/2,031.40 = 770.87/x
  3. Step 3: Cross multiply
    1,355.38x = 2,031.40 × 770.87
  4. Step 4: Simplify right side
    1,355.38x = 1,565,945.32
  5. Step 5: Solve for x
    x = 1,565,945.32/1,355.38
  6. Step 6: Final answer
    x = 1,155.36

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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.