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Finding the Fourth Proportional to 28,431, 39,232.35 and 18,359.87

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Solution

The fourth proportional to 28,431, 39,232.35 and 18,359.87 is: 25,335.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,431 : 39,232.35 = 18,359.87 : x
  2. Step 2: Convert to fraction form
    28,431/39,232.35 = 18,359.87/x
  3. Step 3: Cross multiply
    28,431x = 39,232.35 × 18,359.87
  4. Step 4: Simplify right side
    28,431x = 720,300,649.63
  5. Step 5: Solve for x
    x = 720,300,649.63/28,431
  6. Step 6: Final answer
    x = 25,335.04

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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.