Home / 13,690.41-18,890.58-7,720.71

Finding the Fourth Proportional to 13,690.41, 18,890.58 and 7,720.71

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Solution

The fourth proportional to 13,690.41, 18,890.58 and 7,720.71 is: 10,653.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,690.41 : 18,890.58 = 7,720.71 : x
  2. Step 2: Convert to fraction form
    13,690.41/18,890.58 = 7,720.71/x
  3. Step 3: Cross multiply
    13,690.41x = 18,890.58 × 7,720.71
  4. Step 4: Simplify right side
    13,690.41x = 145,848,689.91
  5. Step 5: Solve for x
    x = 145,848,689.91/13,690.41
  6. Step 6: Final answer
    x = 10,653.35

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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.