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Finding the Fourth Proportional to 2,011.80, 3,017.70 and 918.30

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Solution

The fourth proportional to 2,011.80, 3,017.70 and 918.30 is: 1,377.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,011.80 : 3,017.70 = 918.30 : x
  2. Step 2: Convert to fraction form
    2,011.80/3,017.70 = 918.30/x
  3. Step 3: Cross multiply
    2,011.80x = 3,017.70 × 918.30
  4. Step 4: Simplify right side
    2,011.80x = 2,771,153.91
  5. Step 5: Solve for x
    x = 2,771,153.91/2,011.80
  6. Step 6: Final answer
    x = 1,377.45

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1.5x scale

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.