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Finding the Fourth Proportional to 26,955.80, 40,428.30 and 12,915.80

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Solution

The fourth proportional to 26,955.80, 40,428.30 and 12,915.80 is: 19,371.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,955.80 : 40,428.30 = 12,915.80 : x
  2. Step 2: Convert to fraction form
    26,955.80/40,428.30 = 12,915.80/x
  3. Step 3: Cross multiply
    26,955.80x = 40,428.30 × 12,915.80
  4. Step 4: Simplify right side
    26,955.80x = 522,163,837.14
  5. Step 5: Solve for x
    x = 522,163,837.14/26,955.80
  6. Step 6: Final answer
    x = 19,371.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.