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Finding the Fourth Proportional to 28,710.59, 43,065.87 and 8,990.69

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Solution

The fourth proportional to 28,710.59, 43,065.87 and 8,990.69 is: 13,486.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,710.59 : 43,065.87 = 8,990.69 : x
  2. Step 2: Convert to fraction form
    28,710.59/43,065.87 = 8,990.69/x
  3. Step 3: Cross multiply
    28,710.59x = 43,065.87 × 8,990.69
  4. Step 4: Simplify right side
    28,710.59x = 387,191,671.42
  5. Step 5: Solve for x
    x = 387,191,671.42/28,710.59
  6. Step 6: Final answer
    x = 13,486.03

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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.