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Finding the Fourth Proportional to 909.78, 1,364.67 and 260.57

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Solution

The fourth proportional to 909.78, 1,364.67 and 260.57 is: 390.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.78 : 1,364.67 = 260.57 : x
  2. Step 2: Convert to fraction form
    909.78/1,364.67 = 260.57/x
  3. Step 3: Cross multiply
    909.78x = 1,364.67 × 260.57
  4. Step 4: Simplify right side
    909.78x = 355,585.24
  5. Step 5: Solve for x
    x = 355,585.24/909.78
  6. Step 6: Final answer
    x = 390.85

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Double scale
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Similar ratio
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1.5x scale

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.