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Finding the Fourth Proportional to 1,245.44, 1,868.16 and 515

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Solution

The fourth proportional to 1,245.44, 1,868.16 and 515 is: 772.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.44 : 1,868.16 = 515 : x
  2. Step 2: Convert to fraction form
    1,245.44/1,868.16 = 515/x
  3. Step 3: Cross multiply
    1,245.44x = 1,868.16 × 515
  4. Step 4: Simplify right side
    1,245.44x = 962,102.40
  5. Step 5: Solve for x
    x = 962,102.40/1,245.44
  6. Step 6: Final answer
    x = 772.50

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.