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Finding the Fourth Proportional to 19,920.12, 29,878.72 and 7,435.32

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Solution

The fourth proportional to 19,920.12, 29,878.72 and 7,435.32 is: 11,152.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,920.12 : 29,878.72 = 7,435.32 : x
  2. Step 2: Convert to fraction form
    19,920.12/29,878.72 = 7,435.32/x
  3. Step 3: Cross multiply
    19,920.12x = 29,878.72 × 7,435.32
  4. Step 4: Simplify right side
    19,920.12x = 222,157,844.39
  5. Step 5: Solve for x
    x = 222,157,844.39/19,920.12
  6. Step 6: Final answer
    x = 11,152.44

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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.