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Finding the Fourth Proportional to 909.78, 1,364.66 and 260.51

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Solution

The fourth proportional to 909.78, 1,364.66 and 260.51 is: 390.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.78 : 1,364.66 = 260.51 : x
  2. Step 2: Convert to fraction form
    909.78/1,364.66 = 260.51/x
  3. Step 3: Cross multiply
    909.78x = 1,364.66 × 260.51
  4. Step 4: Simplify right side
    909.78x = 355,508.10
  5. Step 5: Solve for x
    x = 355,508.10/909.78
  6. Step 6: Final answer
    x = 390.76

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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.