Home / 20,688.60-31,040.10-7,541.40

Finding the Fourth Proportional to 20,688.60, 31,040.10 and 7,541.40

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Solution

The fourth proportional to 20,688.60, 31,040.10 and 7,541.40 is: 11,314.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,688.60 : 31,040.10 = 7,541.40 : x
  2. Step 2: Convert to fraction form
    20,688.60/31,040.10 = 7,541.40/x
  3. Step 3: Cross multiply
    20,688.60x = 31,040.10 × 7,541.40
  4. Step 4: Simplify right side
    20,688.60x = 234,085,810.14
  5. Step 5: Solve for x
    x = 234,085,810.14/20,688.60
  6. Step 6: Final answer
    x = 11,314.72

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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.