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Finding the Fourth Proportional to 90,400.70, 135,603.45 and 28,072.70

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Solution

The fourth proportional to 90,400.70, 135,603.45 and 28,072.70 is: 42,109.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,400.70 : 135,603.45 = 28,072.70 : x
  2. Step 2: Convert to fraction form
    90,400.70/135,603.45 = 28,072.70/x
  3. Step 3: Cross multiply
    90,400.70x = 135,603.45 × 28,072.70
  4. Step 4: Simplify right side
    90,400.70x = 3,806,754,970.82
  5. Step 5: Solve for x
    x = 3,806,754,970.82/90,400.70
  6. Step 6: Final answer
    x = 42,109.80

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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.