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Finding the Fourth Proportional to 28,985.76, 43,478.64 and 8,209.26

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Solution

The fourth proportional to 28,985.76, 43,478.64 and 8,209.26 is: 12,313.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,985.76 : 43,478.64 = 8,209.26 : x
  2. Step 2: Convert to fraction form
    28,985.76/43,478.64 = 8,209.26/x
  3. Step 3: Cross multiply
    28,985.76x = 43,478.64 × 8,209.26
  4. Step 4: Simplify right side
    28,985.76x = 356,927,460.21
  5. Step 5: Solve for x
    x = 356,927,460.21/28,985.76
  6. Step 6: Final answer
    x = 12,313.89

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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.