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Finding the Fourth Proportional to 20,871.30, 28,803.95 and 12,918.15

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Solution

The fourth proportional to 20,871.30, 28,803.95 and 12,918.15 is: 17,828.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.30 : 28,803.95 = 12,918.15 : x
  2. Step 2: Convert to fraction form
    20,871.30/28,803.95 = 12,918.15/x
  3. Step 3: Cross multiply
    20,871.30x = 28,803.95 × 12,918.15
  4. Step 4: Simplify right side
    20,871.30x = 372,093,682.10
  5. Step 5: Solve for x
    x = 372,093,682.10/20,871.30
  6. Step 6: Final answer
    x = 17,828.01

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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.