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Finding the Fourth Proportional to 1,025.78, 1,415.52 and 560

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Solution

The fourth proportional to 1,025.78, 1,415.52 and 560 is: 772.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,025.78 : 1,415.52 = 560 : x
  2. Step 2: Convert to fraction form
    1,025.78/1,415.52 = 560/x
  3. Step 3: Cross multiply
    1,025.78x = 1,415.52 × 560
  4. Step 4: Simplify right side
    1,025.78x = 792,691.20
  5. Step 5: Solve for x
    x = 792,691.20/1,025.78
  6. Step 6: Final answer
    x = 772.77

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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.