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Finding the Fourth Proportional to 15,458.94, 21,333.35 and 8,385.39

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Solution

The fourth proportional to 15,458.94, 21,333.35 and 8,385.39 is: 11,571.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,458.94 : 21,333.35 = 8,385.39 : x
  2. Step 2: Convert to fraction form
    15,458.94/21,333.35 = 8,385.39/x
  3. Step 3: Cross multiply
    15,458.94x = 21,333.35 × 8,385.39
  4. Step 4: Simplify right side
    15,458.94x = 178,888,459.76
  5. Step 5: Solve for x
    x = 178,888,459.76/15,458.94
  6. Step 6: Final answer
    x = 11,571.85

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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.