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Finding the Fourth Proportional to 909.56, 1,364.40 and 260.35

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Solution

The fourth proportional to 909.56, 1,364.40 and 260.35 is: 390.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.56 : 1,364.40 = 260.35 : x
  2. Step 2: Convert to fraction form
    909.56/1,364.40 = 260.35/x
  3. Step 3: Cross multiply
    909.56x = 1,364.40 × 260.35
  4. Step 4: Simplify right side
    909.56x = 355,218.13
  5. Step 5: Solve for x
    x = 355,218.13/909.56
  6. Step 6: Final answer
    x = 390.54

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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.