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Finding the Fourth Proportional to 208,470.40, 312,859.20 and 83,900.80

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Solution

The fourth proportional to 208,470.40, 312,859.20 and 83,900.80 is: 125,913.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,470.40 : 312,859.20 = 83,900.80 : x
  2. Step 2: Convert to fraction form
    208,470.40/312,859.20 = 83,900.80/x
  3. Step 3: Cross multiply
    208,470.40x = 312,859.20 × 83,900.80
  4. Step 4: Simplify right side
    208,470.40x = 26,249,137,167.36
  5. Step 5: Solve for x
    x = 26,249,137,167.36/208,470.40
  6. Step 6: Final answer
    x = 125,913.02

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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.