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Finding the Fourth Proportional to 90,912.68, 136,390.47 and 28,583.18

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Solution

The fourth proportional to 90,912.68, 136,390.47 and 28,583.18 is: 42,881.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,912.68 : 136,390.47 = 28,583.18 : x
  2. Step 2: Convert to fraction form
    90,912.68/136,390.47 = 28,583.18/x
  3. Step 3: Cross multiply
    90,912.68x = 136,390.47 × 28,583.18
  4. Step 4: Simplify right side
    90,912.68x = 3,898,472,672.34
  5. Step 5: Solve for x
    x = 3,898,472,672.34/90,912.68
  6. Step 6: Final answer
    x = 42,881.51

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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.