Home / 13,378.88-18,458.70-7,712.90

Finding the Fourth Proportional to 13,378.88, 18,458.70 and 7,712.90

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Solution

The fourth proportional to 13,378.88, 18,458.70 and 7,712.90 is: 10,641.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,378.88 : 18,458.70 = 7,712.90 : x
  2. Step 2: Convert to fraction form
    13,378.88/18,458.70 = 7,712.90/x
  3. Step 3: Cross multiply
    13,378.88x = 18,458.70 × 7,712.90
  4. Step 4: Simplify right side
    13,378.88x = 142,370,014.94
  5. Step 5: Solve for x
    x = 142,370,014.94/13,378.88
  6. Step 6: Final answer
    x = 10,641.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.