Home / 20,688.60-31,040.10-9,005.40

Finding the Fourth Proportional to 20,688.60, 31,040.10 and 9,005.40

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Solution

The fourth proportional to 20,688.60, 31,040.10 and 9,005.40 is: 13,511.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,688.60 : 31,040.10 = 9,005.40 : x
  2. Step 2: Convert to fraction form
    20,688.60/31,040.10 = 9,005.40/x
  3. Step 3: Cross multiply
    20,688.60x = 31,040.10 × 9,005.40
  4. Step 4: Simplify right side
    20,688.60x = 279,528,516.54
  5. Step 5: Solve for x
    x = 279,528,516.54/20,688.60
  6. Step 6: Final answer
    x = 13,511.23

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1.5x scale

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.