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Finding the Fourth Proportional to 30,215.40, 45,317.70 and 19,102.20

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Solution

The fourth proportional to 30,215.40, 45,317.70 and 19,102.20 is: 28,649.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,215.40 : 45,317.70 = 19,102.20 : x
  2. Step 2: Convert to fraction form
    30,215.40/45,317.70 = 19,102.20/x
  3. Step 3: Cross multiply
    30,215.40x = 45,317.70 × 19,102.20
  4. Step 4: Simplify right side
    30,215.40x = 865,667,768.94
  5. Step 5: Solve for x
    x = 865,667,768.94/30,215.40
  6. Step 6: Final answer
    x = 28,649.89

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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.