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Finding the Fourth Proportional to 90,775.40, 135,968.70 and 73,279.40

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Solution

The fourth proportional to 90,775.40, 135,968.70 and 73,279.40 is: 109,762.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,775.40 : 135,968.70 = 73,279.40 : x
  2. Step 2: Convert to fraction form
    90,775.40/135,968.70 = 73,279.40/x
  3. Step 3: Cross multiply
    90,775.40x = 135,968.70 × 73,279.40
  4. Step 4: Simplify right side
    90,775.40x = 9,963,704,754.78
  5. Step 5: Solve for x
    x = 9,963,704,754.78/90,775.40
  6. Step 6: Final answer
    x = 109,762.17

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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.