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Finding the Fourth Proportional to 90,603.70, 135,905.50 and 28,274.20

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Solution

The fourth proportional to 90,603.70, 135,905.50 and 28,274.20 is: 42,411.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,603.70 : 135,905.50 = 28,274.20 : x
  2. Step 2: Convert to fraction form
    90,603.70/135,905.50 = 28,274.20/x
  3. Step 3: Cross multiply
    90,603.70x = 135,905.50 × 28,274.20
  4. Step 4: Simplify right side
    90,603.70x = 3,842,619,288.10
  5. Step 5: Solve for x
    x = 3,842,619,288.10/90,603.70
  6. Step 6: Final answer
    x = 42,411.28

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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.