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Finding the Fourth Proportional to 902.77, 1,245.68 and 509.78

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Solution

The fourth proportional to 902.77, 1,245.68 and 509.78 is: 703.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.77 : 1,245.68 = 509.78 : x
  2. Step 2: Convert to fraction form
    902.77/1,245.68 = 509.78/x
  3. Step 3: Cross multiply
    902.77x = 1,245.68 × 509.78
  4. Step 4: Simplify right side
    902.77x = 635,025.23
  5. Step 5: Solve for x
    x = 635,025.23/902.77
  6. Step 6: Final answer
    x = 703.42

Related Problems

Find fourth proportional to 451.38, 622.84 and 254.89
Half scale
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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.