Home / 140,513.20-210,769.80-81,318.40

Finding the Fourth Proportional to 140,513.20, 210,769.80 and 81,318.40

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Solution

The fourth proportional to 140,513.20, 210,769.80 and 81,318.40 is: 121,977.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,513.20 : 210,769.80 = 81,318.40 : x
  2. Step 2: Convert to fraction form
    140,513.20/210,769.80 = 81,318.40/x
  3. Step 3: Cross multiply
    140,513.20x = 210,769.80 × 81,318.40
  4. Step 4: Simplify right side
    140,513.20x = 17,139,462,904.32
  5. Step 5: Solve for x
    x = 17,139,462,904.32/140,513.20
  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.