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Finding the Fourth Proportional to 85,969.65, 128,929.50 and 36,048.36

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Solution

The fourth proportional to 85,969.65, 128,929.50 and 36,048.36 is: 54,062.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,969.65 : 128,929.50 = 36,048.36 : x
  2. Step 2: Convert to fraction form
    85,969.65/128,929.50 = 36,048.36/x
  3. Step 3: Cross multiply
    85,969.65x = 128,929.50 × 36,048.36
  4. Step 4: Simplify right side
    85,969.65x = 4,647,697,030.62
  5. Step 5: Solve for x
    x = 4,647,697,030.62/85,969.65
  6. Step 6: Final answer
    x = 54,062.07

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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.