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Finding the Fourth Proportional to 108,378.84, 149,613.93 and 81,531.57

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Solution

The fourth proportional to 108,378.84, 149,613.93 and 81,531.57 is: 112,552.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,378.84 : 149,613.93 = 81,531.57 : x
  2. Step 2: Convert to fraction form
    108,378.84/149,613.93 = 81,531.57/x
  3. Step 3: Cross multiply
    108,378.84x = 149,613.93 × 81,531.57
  4. Step 4: Simplify right side
    108,378.84x = 12,198,258,606.77
  5. Step 5: Solve for x
    x = 12,198,258,606.77/108,378.84
  6. Step 6: Final answer
    x = 112,552.03

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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.