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Finding the Fourth Proportional to 89,720.40, 134,429.40 and 70,928.40

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Solution

The fourth proportional to 89,720.40, 134,429.40 and 70,928.40 is: 106,273.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,720.40 : 134,429.40 = 70,928.40 : x
  2. Step 2: Convert to fraction form
    89,720.40/134,429.40 = 70,928.40/x
  3. Step 3: Cross multiply
    89,720.40x = 134,429.40 × 70,928.40
  4. Step 4: Simplify right side
    89,720.40x = 9,534,862,254.96
  5. Step 5: Solve for x
    x = 9,534,862,254.96/89,720.40
  6. Step 6: Final answer
    x = 106,273.07

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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.