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Finding the Fourth Proportional to 19,005.15, 28,492.32 and 7,920.15

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Solution

The fourth proportional to 19,005.15, 28,492.32 and 7,920.15 is: 11,873.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,005.15 : 28,492.32 = 7,920.15 : x
  2. Step 2: Convert to fraction form
    19,005.15/28,492.32 = 7,920.15/x
  3. Step 3: Cross multiply
    19,005.15x = 28,492.32 × 7,920.15
  4. Step 4: Simplify right side
    19,005.15x = 225,663,448.25
  5. Step 5: Solve for x
    x = 225,663,448.25/19,005.15
  6. Step 6: Final answer
    x = 11,873.81

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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.