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Finding the Fourth Proportional to 208,440.40, 312,660.60 and 90,029.20

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Solution

The fourth proportional to 208,440.40, 312,660.60 and 90,029.20 is: 135,043.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,440.40 : 312,660.60 = 90,029.20 : x
  2. Step 2: Convert to fraction form
    208,440.40/312,660.60 = 90,029.20/x
  3. Step 3: Cross multiply
    208,440.40x = 312,660.60 × 90,029.20
  4. Step 4: Simplify right side
    208,440.40x = 28,148,583,689.52
  5. Step 5: Solve for x
    x = 28,148,583,689.52/208,440.40
  6. Step 6: Final answer
    x = 135,043.80

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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.