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Finding the Fourth Proportional to 388,830.20, 583,245.30 and 139,479.80

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Solution

The fourth proportional to 388,830.20, 583,245.30 and 139,479.80 is: 209,219.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,830.20 : 583,245.30 = 139,479.80 : x
  2. Step 2: Convert to fraction form
    388,830.20/583,245.30 = 139,479.80/x
  3. Step 3: Cross multiply
    388,830.20x = 583,245.30 × 139,479.80
  4. Step 4: Simplify right side
    388,830.20x = 81,350,937,794.94
  5. Step 5: Solve for x
    x = 81,350,937,794.94/388,830.20
  6. Step 6: Final answer
    x = 209,219.70

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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.