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Finding the Fourth Proportional to 21,959.28, 30,303.90 and 12,533.28

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Solution

The fourth proportional to 21,959.28, 30,303.90 and 12,533.28 is: 17,295.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,959.28 : 30,303.90 = 12,533.28 : x
  2. Step 2: Convert to fraction form
    21,959.28/30,303.90 = 12,533.28/x
  3. Step 3: Cross multiply
    21,959.28x = 30,303.90 × 12,533.28
  4. Step 4: Simplify right side
    21,959.28x = 379,807,263.79
  5. Step 5: Solve for x
    x = 379,807,263.79/21,959.28
  6. Step 6: Final answer
    x = 17,295.98

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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.