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Finding the Fourth Proportional to 90,254, 135,378.24 and 42,903.20

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Solution

The fourth proportional to 90,254, 135,378.24 and 42,903.20 is: 64,353.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,254 : 135,378.24 = 42,903.20 : x
  2. Step 2: Convert to fraction form
    90,254/135,378.24 = 42,903.20/x
  3. Step 3: Cross multiply
    90,254x = 135,378.24 × 42,903.20
  4. Step 4: Simplify right side
    90,254x = 5,808,159,706.37
  5. Step 5: Solve for x
    x = 5,808,159,706.37/90,254
  6. Step 6: Final answer
    x = 64,353.49

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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.