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Finding the Fourth Proportional to 28,999.47, 43,499.21 and 7,111.47

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Solution

The fourth proportional to 28,999.47, 43,499.21 and 7,111.47 is: 10,667.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,999.47 : 43,499.21 = 7,111.47 : x
  2. Step 2: Convert to fraction form
    28,999.47/43,499.21 = 7,111.47/x
  3. Step 3: Cross multiply
    28,999.47x = 43,499.21 × 7,111.47
  4. Step 4: Simplify right side
    28,999.47x = 309,343,291.38
  5. Step 5: Solve for x
    x = 309,343,291.38/28,999.47
  6. Step 6: Final answer
    x = 10,667.21

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Similar ratio
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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.