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Finding the Fourth Proportional to 21,750.40, 30,017.28 and 12,321.28

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Solution

The fourth proportional to 21,750.40, 30,017.28 and 12,321.28 is: 17,004.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,750.40 : 30,017.28 = 12,321.28 : x
  2. Step 2: Convert to fraction form
    21,750.40/30,017.28 = 12,321.28/x
  3. Step 3: Cross multiply
    21,750.40x = 30,017.28 × 12,321.28
  4. Step 4: Simplify right side
    21,750.40x = 369,851,311.72
  5. Step 5: Solve for x
    x = 369,851,311.72/21,750.40
  6. Step 6: Final answer
    x = 17,004.35

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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.