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Finding the Fourth Proportional to 2,989.99, 4,485.14 and 909.83

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Solution

The fourth proportional to 2,989.99, 4,485.14 and 909.83 is: 1,364.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,989.99 : 4,485.14 = 909.83 : x
  2. Step 2: Convert to fraction form
    2,989.99/4,485.14 = 909.83/x
  3. Step 3: Cross multiply
    2,989.99x = 4,485.14 × 909.83
  4. Step 4: Simplify right side
    2,989.99x = 4,080,721.59
  5. Step 5: Solve for x
    x = 4,080,721.59/2,989.99
  6. Step 6: Final answer
    x = 1,364.80

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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.