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Finding the Fourth Proportional to 28,556.80, 42,835.20 and 25,640.80

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Solution

The fourth proportional to 28,556.80, 42,835.20 and 25,640.80 is: 38,461.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,556.80 : 42,835.20 = 25,640.80 : x
  2. Step 2: Convert to fraction form
    28,556.80/42,835.20 = 25,640.80/x
  3. Step 3: Cross multiply
    28,556.80x = 42,835.20 × 25,640.80
  4. Step 4: Simplify right side
    28,556.80x = 1,098,328,796.16
  5. Step 5: Solve for x
    x = 1,098,328,796.16/28,556.80
  6. Step 6: Final answer
    x = 38,461.20

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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.