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Finding the Fourth Proportional to 326,609.70, 489,914.55 and 139,640.10

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Solution

The fourth proportional to 326,609.70, 489,914.55 and 139,640.10 is: 209,460.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,609.70 : 489,914.55 = 139,640.10 : x
  2. Step 2: Convert to fraction form
    326,609.70/489,914.55 = 139,640.10/x
  3. Step 3: Cross multiply
    326,609.70x = 489,914.55 × 139,640.10
  4. Step 4: Simplify right side
    326,609.70x = 68,411,716,753.46
  5. Step 5: Solve for x
    x = 68,411,716,753.46/326,609.70
  6. Step 6: Final answer
    x = 209,460.15

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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.