Home / 15,403.40-21,258.89-8,689.65

Finding the Fourth Proportional to 15,403.40, 21,258.89 and 8,689.65

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Solution

The fourth proportional to 15,403.40, 21,258.89 and 8,689.65 is: 11,992.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,403.40 : 21,258.89 = 8,689.65 : x
  2. Step 2: Convert to fraction form
    15,403.40/21,258.89 = 8,689.65/x
  3. Step 3: Cross multiply
    15,403.40x = 21,258.89 × 8,689.65
  4. Step 4: Simplify right side
    15,403.40x = 184,732,342.49
  5. Step 5: Solve for x
    x = 184,732,342.49/15,403.40
  6. Step 6: Final answer
    x = 11,992.96

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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.