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Finding the Fourth Proportional to 91,029.64, 136,544.48 and 28,705

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Solution

The fourth proportional to 91,029.64, 136,544.48 and 28,705 is: 43,057.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,029.64 : 136,544.48 = 28,705 : x
  2. Step 2: Convert to fraction form
    91,029.64/136,544.48 = 28,705/x
  3. Step 3: Cross multiply
    91,029.64x = 136,544.48 × 28,705
  4. Step 4: Simplify right side
    91,029.64x = 3,919,509,298.40
  5. Step 5: Solve for x
    x = 3,919,509,298.40/91,029.64
  6. Step 6: Final answer
    x = 43,057.51

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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.