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Finding the Fourth Proportional to 1,264.64, 1,898.19 and 778.64

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Solution

The fourth proportional to 1,264.64, 1,898.19 and 778.64 is: 1,168.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,264.64 : 1,898.19 = 778.64 : x
  2. Step 2: Convert to fraction form
    1,264.64/1,898.19 = 778.64/x
  3. Step 3: Cross multiply
    1,264.64x = 1,898.19 × 778.64
  4. Step 4: Simplify right side
    1,264.64x = 1,478,006.66
  5. Step 5: Solve for x
    x = 1,478,006.66/1,264.64
  6. Step 6: Final answer
    x = 1,168.72

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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.