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Finding the Fourth Proportional to 91,080.96, 136,640.88 and 31,920.24

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Solution

The fourth proportional to 91,080.96, 136,640.88 and 31,920.24 is: 47,887.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,080.96 : 136,640.88 = 31,920.24 : x
  2. Step 2: Convert to fraction form
    91,080.96/136,640.88 = 31,920.24/x
  3. Step 3: Cross multiply
    91,080.96x = 136,640.88 × 31,920.24
  4. Step 4: Simplify right side
    91,080.96x = 4,361,609,683.41
  5. Step 5: Solve for x
    x = 4,361,609,683.41/91,080.96
  6. Step 6: Final answer
    x = 47,887.17

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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.