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Finding the Fourth Proportional to 89,709.40, 134,412.90 and 70,917.40

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Solution

The fourth proportional to 89,709.40, 134,412.90 and 70,917.40 is: 106,256.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,709.40 : 134,412.90 = 70,917.40 : x
  2. Step 2: Convert to fraction form
    89,709.40/134,412.90 = 70,917.40/x
  3. Step 3: Cross multiply
    89,709.40x = 134,412.90 × 70,917.40
  4. Step 4: Simplify right side
    89,709.40x = 9,532,213,394.46
  5. Step 5: Solve for x
    x = 9,532,213,394.46/89,709.40
  6. Step 6: Final answer
    x = 106,256.57

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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.