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Finding the Fourth Proportional to 928.74, 1,391.74 and 440.77

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Solution

The fourth proportional to 928.74, 1,391.74 and 440.77 is: 660.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.74 : 1,391.74 = 440.77 : x
  2. Step 2: Convert to fraction form
    928.74/1,391.74 = 440.77/x
  3. Step 3: Cross multiply
    928.74x = 1,391.74 × 440.77
  4. Step 4: Simplify right side
    928.74x = 613,437.24
  5. Step 5: Solve for x
    x = 613,437.24/928.74
  6. Step 6: Final answer
    x = 660.50

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Half scale
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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.