Home / 12,947.40-19,421.10-10,128.60

Finding the Fourth Proportional to 12,947.40, 19,421.10 and 10,128.60

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Solution

The fourth proportional to 12,947.40, 19,421.10 and 10,128.60 is: 15,192.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,947.40 : 19,421.10 = 10,128.60 : x
  2. Step 2: Convert to fraction form
    12,947.40/19,421.10 = 10,128.60/x
  3. Step 3: Cross multiply
    12,947.40x = 19,421.10 × 10,128.60
  4. Step 4: Simplify right side
    12,947.40x = 196,708,553.46
  5. Step 5: Solve for x
    x = 196,708,553.46/12,947.40
  6. Step 6: Final answer
    x = 15,192.90

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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.