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Finding the Fourth Proportional to 28,129.80, 42,203.94 and 11,503.81

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Solution

The fourth proportional to 28,129.80, 42,203.94 and 11,503.81 is: 17,259.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,129.80 : 42,203.94 = 11,503.81 : x
  2. Step 2: Convert to fraction form
    28,129.80/42,203.94 = 11,503.81/x
  3. Step 3: Cross multiply
    28,129.80x = 42,203.94 × 11,503.81
  4. Step 4: Simplify right side
    28,129.80x = 485,506,116.63
  5. Step 5: Solve for x
    x = 485,506,116.63/28,129.80
  6. Step 6: Final answer
    x = 17,259.49

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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.