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Finding the Fourth Proportional to 11,235.68, 16,920.80 and 10,239.20

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Solution

The fourth proportional to 11,235.68, 16,920.80 and 10,239.20 is: 15,420.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,235.68 : 16,920.80 = 10,239.20 : x
  2. Step 2: Convert to fraction form
    11,235.68/16,920.80 = 10,239.20/x
  3. Step 3: Cross multiply
    11,235.68x = 16,920.80 × 10,239.20
  4. Step 4: Simplify right side
    11,235.68x = 173,255,455.36
  5. Step 5: Solve for x
    x = 173,255,455.36/11,235.68
  6. Step 6: Final answer
    x = 15,420.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.