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Finding the Fourth Proportional to 30,456.80, 45,728.40 and 18,792.80

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Solution

The fourth proportional to 30,456.80, 45,728.40 and 18,792.80 is: 28,215.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,456.80 : 45,728.40 = 18,792.80 : x
  2. Step 2: Convert to fraction form
    30,456.80/45,728.40 = 18,792.80/x
  3. Step 3: Cross multiply
    30,456.80x = 45,728.40 × 18,792.80
  4. Step 4: Simplify right side
    30,456.80x = 859,364,675.52
  5. Step 5: Solve for x
    x = 859,364,675.52/30,456.80
  6. Step 6: Final answer
    x = 28,215.86

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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.