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Finding the Fourth Proportional to 15,807.36, 21,751.20 and 15,326.40

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Solution

The fourth proportional to 15,807.36, 21,751.20 and 15,326.40 is: 21,089.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,807.36 : 21,751.20 = 15,326.40 : x
  2. Step 2: Convert to fraction form
    15,807.36/21,751.20 = 15,326.40/x
  3. Step 3: Cross multiply
    15,807.36x = 21,751.20 × 15,326.40
  4. Step 4: Simplify right side
    15,807.36x = 333,367,591.68
  5. Step 5: Solve for x
    x = 333,367,591.68/15,807.36
  6. Step 6: Final answer
    x = 21,089.39

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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.