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Finding the Fourth Proportional to 261,683.70, 392,525.55 and 220,211.70

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Solution

The fourth proportional to 261,683.70, 392,525.55 and 220,211.70 is: 330,317.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,683.70 : 392,525.55 = 220,211.70 : x
  2. Step 2: Convert to fraction form
    261,683.70/392,525.55 = 220,211.70/x
  3. Step 3: Cross multiply
    261,683.70x = 392,525.55 × 220,211.70
  4. Step 4: Simplify right side
    261,683.70x = 86,438,718,658.94
  5. Step 5: Solve for x
    x = 86,438,718,658.94/261,683.70
  6. Step 6: Final answer
    x = 330,317.55

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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.