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Finding the Fourth Proportional to 1,000.08, 1,378.45 and 668.38

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Solution

The fourth proportional to 1,000.08, 1,378.45 and 668.38 is: 921.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.08 : 1,378.45 = 668.38 : x
  2. Step 2: Convert to fraction form
    1,000.08/1,378.45 = 668.38/x
  3. Step 3: Cross multiply
    1,000.08x = 1,378.45 × 668.38
  4. Step 4: Simplify right side
    1,000.08x = 921,328.41
  5. Step 5: Solve for x
    x = 921,328.41/1,000.08
  6. Step 6: Final answer
    x = 921.26

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1.5x scale

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.