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Finding the Fourth Proportional to 909.46, 1,364.25 and 440.79

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Solution

The fourth proportional to 909.46, 1,364.25 and 440.79 is: 661.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.46 : 1,364.25 = 440.79 : x
  2. Step 2: Convert to fraction form
    909.46/1,364.25 = 440.79/x
  3. Step 3: Cross multiply
    909.46x = 1,364.25 × 440.79
  4. Step 4: Simplify right side
    909.46x = 601,347.76
  5. Step 5: Solve for x
    x = 601,347.76/909.46
  6. Step 6: Final answer
    x = 661.21

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Double scale
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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.