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Finding the Fourth Proportional to 19,145.70, 28,740.15 and 11,358.90

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Solution

The fourth proportional to 19,145.70, 28,740.15 and 11,358.90 is: 17,051.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,145.70 : 28,740.15 = 11,358.90 : x
  2. Step 2: Convert to fraction form
    19,145.70/28,740.15 = 11,358.90/x
  3. Step 3: Cross multiply
    19,145.70x = 28,740.15 × 11,358.90
  4. Step 4: Simplify right side
    19,145.70x = 326,456,489.84
  5. Step 5: Solve for x
    x = 326,456,489.84/19,145.70
  6. Step 6: Final answer
    x = 17,051.17

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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.