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Finding the Fourth Proportional to 2,637.99, 3,956.91 and 690.20

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Solution

The fourth proportional to 2,637.99, 3,956.91 and 690.20 is: 1,035.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,637.99 : 3,956.91 = 690.20 : x
  2. Step 2: Convert to fraction form
    2,637.99/3,956.91 = 690.20/x
  3. Step 3: Cross multiply
    2,637.99x = 3,956.91 × 690.20
  4. Step 4: Simplify right side
    2,637.99x = 2,731,051.75
  5. Step 5: Solve for x
    x = 2,731,051.75/2,637.99
  6. Step 6: Final answer
    x = 1,035.28

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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.