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Finding the Fourth Proportional to 1,359.76, 1,876.60 and 770.40

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Solution

The fourth proportional to 1,359.76, 1,876.60 and 770.40 is: 1,063.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,359.76 : 1,876.60 = 770.40 : x
  2. Step 2: Convert to fraction form
    1,359.76/1,876.60 = 770.40/x
  3. Step 3: Cross multiply
    1,359.76x = 1,876.60 × 770.40
  4. Step 4: Simplify right side
    1,359.76x = 1,445,732.64
  5. Step 5: Solve for x
    x = 1,445,732.64/1,359.76
  6. Step 6: Final answer
    x = 1,063.23

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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.