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Finding the Fourth Proportional to 28,930.80, 43,400.40 and 12,290.80

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Solution

The fourth proportional to 28,930.80, 43,400.40 and 12,290.80 is: 18,437.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,930.80 : 43,400.40 = 12,290.80 : x
  2. Step 2: Convert to fraction form
    28,930.80/43,400.40 = 12,290.80/x
  3. Step 3: Cross multiply
    28,930.80x = 43,400.40 × 12,290.80
  4. Step 4: Simplify right side
    28,930.80x = 533,425,636.32
  5. Step 5: Solve for x
    x = 533,425,636.32/28,930.80
  6. Step 6: Final answer
    x = 18,437.98

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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.