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Finding the Fourth Proportional to 388,843.20, 583,264.80 and 139,492.80

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Solution

The fourth proportional to 388,843.20, 583,264.80 and 139,492.80 is: 209,239.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,843.20 : 583,264.80 = 139,492.80 : x
  2. Step 2: Convert to fraction form
    388,843.20/583,264.80 = 139,492.80/x
  3. Step 3: Cross multiply
    388,843.20x = 583,264.80 × 139,492.80
  4. Step 4: Simplify right side
    388,843.20x = 81,361,240,093.44
  5. Step 5: Solve for x
    x = 81,361,240,093.44/388,843.20
  6. Step 6: Final answer
    x = 209,239.20

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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.