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Finding the Fourth Proportional to 2,890.79, 3,987.87 and 1,711.30

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Solution

The fourth proportional to 2,890.79, 3,987.87 and 1,711.30 is: 2,360.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,890.79 : 3,987.87 = 1,711.30 : x
  2. Step 2: Convert to fraction form
    2,890.79/3,987.87 = 1,711.30/x
  3. Step 3: Cross multiply
    2,890.79x = 3,987.87 × 1,711.30
  4. Step 4: Simplify right side
    2,890.79x = 6,824,421.99
  5. Step 5: Solve for x
    x = 6,824,421.99/2,890.79
  6. Step 6: Final answer
    x = 2,360.75

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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.