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Finding the Fourth Proportional to 100,890.32, 139,207.52 and 58,446.32

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Solution

The fourth proportional to 100,890.32, 139,207.52 and 58,446.32 is: 80,643.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,890.32 : 139,207.52 = 58,446.32 : x
  2. Step 2: Convert to fraction form
    100,890.32/139,207.52 = 58,446.32/x
  3. Step 3: Cross multiply
    100,890.32x = 139,207.52 × 58,446.32
  4. Step 4: Simplify right side
    100,890.32x = 8,136,167,260.33
  5. Step 5: Solve for x
    x = 8,136,167,260.33/100,890.32
  6. Step 6: Final answer
    x = 80,643.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.