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Finding the Fourth Proportional to 1,178.48, 1,626.30 and 640.12

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Solution

The fourth proportional to 1,178.48, 1,626.30 and 640.12 is: 883.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.48 : 1,626.30 = 640.12 : x
  2. Step 2: Convert to fraction form
    1,178.48/1,626.30 = 640.12/x
  3. Step 3: Cross multiply
    1,178.48x = 1,626.30 × 640.12
  4. Step 4: Simplify right side
    1,178.48x = 1,041,027.16
  5. Step 5: Solve for x
    x = 1,041,027.16/1,178.48
  6. Step 6: Final answer
    x = 883.36

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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.