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Finding the Fourth Proportional to 1,616.80, 2,230.80 and 918.40

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Solution

The fourth proportional to 1,616.80, 2,230.80 and 918.40 is: 1,267.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,616.80 : 2,230.80 = 918.40 : x
  2. Step 2: Convert to fraction form
    1,616.80/2,230.80 = 918.40/x
  3. Step 3: Cross multiply
    1,616.80x = 2,230.80 × 918.40
  4. Step 4: Simplify right side
    1,616.80x = 2,048,766.72
  5. Step 5: Solve for x
    x = 2,048,766.72/1,616.80
  6. Step 6: Final answer
    x = 1,267.17

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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.