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Finding the Fourth Proportional to 34,230.40, 47,212.68 and 21,643

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Solution

The fourth proportional to 34,230.40, 47,212.68 and 21,643 is: 29,851.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    34,230.40 : 47,212.68 = 21,643 : x
  2. Step 2: Convert to fraction form
    34,230.40/47,212.68 = 21,643/x
  3. Step 3: Cross multiply
    34,230.40x = 47,212.68 × 21,643
  4. Step 4: Simplify right side
    34,230.40x = 1,021,824,033.24
  5. Step 5: Solve for x
    x = 1,021,824,033.24/34,230.40
  6. Step 6: Final answer
    x = 29,851.36

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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.