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Finding the Fourth Proportional to 28,235.59, 38,964.13 and 15,661.51

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Solution

The fourth proportional to 28,235.59, 38,964.13 and 15,661.51 is: 21,612.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,235.59 : 38,964.13 = 15,661.51 : x
  2. Step 2: Convert to fraction form
    28,235.59/38,964.13 = 15,661.51/x
  3. Step 3: Cross multiply
    28,235.59x = 38,964.13 × 15,661.51
  4. Step 4: Simplify right side
    28,235.59x = 610,237,111.64
  5. Step 5: Solve for x
    x = 610,237,111.64/28,235.59
  6. Step 6: Final answer
    x = 21,612.34

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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.