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Finding the Fourth Proportional to 31,200.80, 46,801.20 and 12,489.80

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Solution

The fourth proportional to 31,200.80, 46,801.20 and 12,489.80 is: 18,734.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,200.80 : 46,801.20 = 12,489.80 : x
  2. Step 2: Convert to fraction form
    31,200.80/46,801.20 = 12,489.80/x
  3. Step 3: Cross multiply
    31,200.80x = 46,801.20 × 12,489.80
  4. Step 4: Simplify right side
    31,200.80x = 584,537,627.76
  5. Step 5: Solve for x
    x = 584,537,627.76/31,200.80
  6. Step 6: Final answer
    x = 18,734.70

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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.