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Finding the Fourth Proportional to 1,050.70, 1,578.30 and 640.06

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Solution

The fourth proportional to 1,050.70, 1,578.30 and 640.06 is: 961.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,050.70 : 1,578.30 = 640.06 : x
  2. Step 2: Convert to fraction form
    1,050.70/1,578.30 = 640.06/x
  3. Step 3: Cross multiply
    1,050.70x = 1,578.30 × 640.06
  4. Step 4: Simplify right side
    1,050.70x = 1,010,206.70
  5. Step 5: Solve for x
    x = 1,010,206.70/1,050.70
  6. Step 6: Final answer
    x = 961.46

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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.