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Finding the Fourth Proportional to 28,756.40, 39,682.80 and 16,009.20

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Solution

The fourth proportional to 28,756.40, 39,682.80 and 16,009.20 is: 22,092.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,756.40 : 39,682.80 = 16,009.20 : x
  2. Step 2: Convert to fraction form
    28,756.40/39,682.80 = 16,009.20/x
  3. Step 3: Cross multiply
    28,756.40x = 39,682.80 × 16,009.20
  4. Step 4: Simplify right side
    28,756.40x = 635,289,881.76
  5. Step 5: Solve for x
    x = 635,289,881.76/28,756.40
  6. Step 6: Final answer
    x = 22,092.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.