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Finding the Fourth Proportional to 112,770.40, 168,688.12 and 85,913.19

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Solution

The fourth proportional to 112,770.40, 168,688.12 and 85,913.19 is: 128,513.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,770.40 : 168,688.12 = 85,913.19 : x
  2. Step 2: Convert to fraction form
    112,770.40/168,688.12 = 85,913.19/x
  3. Step 3: Cross multiply
    112,770.40x = 168,688.12 × 85,913.19
  4. Step 4: Simplify right side
    112,770.40x = 14,492,534,504.30
  5. Step 5: Solve for x
    x = 14,492,534,504.30/112,770.40
  6. Step 6: Final answer
    x = 128,513.64

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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.