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Finding the Fourth Proportional to 143,526.40, 215,289.60 and 81,318.40

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Solution

The fourth proportional to 143,526.40, 215,289.60 and 81,318.40 is: 121,977.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,526.40 : 215,289.60 = 81,318.40 : x
  2. Step 2: Convert to fraction form
    143,526.40/215,289.60 = 81,318.40/x
  3. Step 3: Cross multiply
    143,526.40x = 215,289.60 × 81,318.40
  4. Step 4: Simplify right side
    143,526.40x = 17,507,005,808.64
  5. Step 5: Solve for x
    x = 17,507,005,808.64/143,526.40
  6. Step 6: Final answer
    x = 121,977.60

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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.