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Finding the Fourth Proportional to 28,615.40, 42,920.22 and 7,841.96

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Solution

The fourth proportional to 28,615.40, 42,920.22 and 7,841.96 is: 11,762.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,615.40 : 42,920.22 = 7,841.96 : x
  2. Step 2: Convert to fraction form
    28,615.40/42,920.22 = 7,841.96/x
  3. Step 3: Cross multiply
    28,615.40x = 42,920.22 × 7,841.96
  4. Step 4: Simplify right side
    28,615.40x = 336,578,648.43
  5. Step 5: Solve for x
    x = 336,578,648.43/28,615.40
  6. Step 6: Final answer
    x = 11,762.15

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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.