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Finding the Fourth Proportional to 326,521.80, 489,782.70 and 139,897.80

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Solution

The fourth proportional to 326,521.80, 489,782.70 and 139,897.80 is: 209,846.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,521.80 : 489,782.70 = 139,897.80 : x
  2. Step 2: Convert to fraction form
    326,521.80/489,782.70 = 139,897.80/x
  3. Step 3: Cross multiply
    326,521.80x = 489,782.70 × 139,897.80
  4. Step 4: Simplify right side
    326,521.80x = 68,519,522,208.06
  5. Step 5: Solve for x
    x = 68,519,522,208.06/326,521.80
  6. Step 6: Final answer
    x = 209,846.70

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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.