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Finding the Fourth Proportional to 902.76, 1,245.78 and 509.74

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Solution

The fourth proportional to 902.76, 1,245.78 and 509.74 is: 703.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.76 : 1,245.78 = 509.74 : x
  2. Step 2: Convert to fraction form
    902.76/1,245.78 = 509.74/x
  3. Step 3: Cross multiply
    902.76x = 1,245.78 × 509.74
  4. Step 4: Simplify right side
    902.76x = 635,023.90
  5. Step 5: Solve for x
    x = 635,023.90/902.76
  6. Step 6: Final answer
    x = 703.42

Related Problems

Find fourth proportional to 451.38, 622.89 and 254.87
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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.