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Finding the Fourth Proportional to 1,061.45, 1,464.81 and 641.66

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Solution

The fourth proportional to 1,061.45, 1,464.81 and 641.66 is: 885.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,061.45 : 1,464.81 = 641.66 : x
  2. Step 2: Convert to fraction form
    1,061.45/1,464.81 = 641.66/x
  3. Step 3: Cross multiply
    1,061.45x = 1,464.81 × 641.66
  4. Step 4: Simplify right side
    1,061.45x = 939,913.65
  5. Step 5: Solve for x
    x = 939,913.65/1,061.45
  6. Step 6: Final answer
    x = 885.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.