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Finding the Fourth Proportional to 261,995.70, 392,993.55 and 72,455.70

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Solution

The fourth proportional to 261,995.70, 392,993.55 and 72,455.70 is: 108,683.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,995.70 : 392,993.55 = 72,455.70 : x
  2. Step 2: Convert to fraction form
    261,995.70/392,993.55 = 72,455.70/x
  3. Step 3: Cross multiply
    261,995.70x = 392,993.55 × 72,455.70
  4. Step 4: Simplify right side
    261,995.70x = 28,474,622,760.74
  5. Step 5: Solve for x
    x = 28,474,622,760.74/261,995.70
  6. Step 6: Final answer
    x = 108,683.55

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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.