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Finding the Fourth Proportional to 14,129.78, 19,498.32 and 7,841.78

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Solution

The fourth proportional to 14,129.78, 19,498.32 and 7,841.78 is: 10,821.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,129.78 : 19,498.32 = 7,841.78 : x
  2. Step 2: Convert to fraction form
    14,129.78/19,498.32 = 7,841.78/x
  3. Step 3: Cross multiply
    14,129.78x = 19,498.32 × 7,841.78
  4. Step 4: Simplify right side
    14,129.78x = 152,901,535.81
  5. Step 5: Solve for x
    x = 152,901,535.81/14,129.78
  6. Step 6: Final answer
    x = 10,821.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.