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Finding the Fourth Proportional to 2,131.70, 2,988.70 and 2,131.70

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Solution

The fourth proportional to 2,131.70, 2,988.70 and 2,131.70 is: 2,988.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,131.70 : 2,988.70 = 2,131.70 : x
  2. Step 2: Convert to fraction form
    2,131.70/2,988.70 = 2,131.70/x
  3. Step 3: Cross multiply
    2,131.70x = 2,988.70 × 2,131.70
  4. Step 4: Simplify right side
    2,131.70x = 6,371,011.79
  5. Step 5: Solve for x
    x = 6,371,011.79/2,131.70
  6. Step 6: Final answer
    x = 2,988.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.