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Finding the Fourth Proportional to 28,643.40, 43,013.70 and 21,256.20

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Solution

The fourth proportional to 28,643.40, 43,013.70 and 21,256.20 is: 31,920.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,643.40 : 43,013.70 = 21,256.20 : x
  2. Step 2: Convert to fraction form
    28,643.40/43,013.70 = 21,256.20/x
  3. Step 3: Cross multiply
    28,643.40x = 43,013.70 × 21,256.20
  4. Step 4: Simplify right side
    28,643.40x = 914,307,809.94
  5. Step 5: Solve for x
    x = 914,307,809.94/28,643.40
  6. Step 6: Final answer
    x = 31,920.37

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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.