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Finding the Fourth Proportional to 28,405.80, 39,187.64 and 16,914.28

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Solution

The fourth proportional to 28,405.80, 39,187.64 and 16,914.28 is: 23,334.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,405.80 : 39,187.64 = 16,914.28 : x
  2. Step 2: Convert to fraction form
    28,405.80/39,187.64 = 16,914.28/x
  3. Step 3: Cross multiply
    28,405.80x = 39,187.64 × 16,914.28
  4. Step 4: Simplify right side
    28,405.80x = 662,830,715.50
  5. Step 5: Solve for x
    x = 662,830,715.50/28,405.80
  6. Step 6: Final answer
    x = 23,334.34

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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.