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Finding the Fourth Proportional to 289,008.80, 433,513.20 and 139,320.80

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Solution

The fourth proportional to 289,008.80, 433,513.20 and 139,320.80 is: 208,981.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,008.80 : 433,513.20 = 139,320.80 : x
  2. Step 2: Convert to fraction form
    289,008.80/433,513.20 = 139,320.80/x
  3. Step 3: Cross multiply
    289,008.80x = 433,513.20 × 139,320.80
  4. Step 4: Simplify right side
    289,008.80x = 60,397,405,834.56
  5. Step 5: Solve for x
    x = 60,397,405,834.56/289,008.80
  6. Step 6: Final answer
    x = 208,981.20

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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.