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Finding the Fourth Proportional to 2,989.86, 4,484.95 and 909.71

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Solution

The fourth proportional to 2,989.86, 4,484.95 and 909.71 is: 1,364.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,989.86 : 4,484.95 = 909.71 : x
  2. Step 2: Convert to fraction form
    2,989.86/4,484.95 = 909.71/x
  3. Step 3: Cross multiply
    2,989.86x = 4,484.95 × 909.71
  4. Step 4: Simplify right side
    2,989.86x = 4,079,979.17
  5. Step 5: Solve for x
    x = 4,079,979.17/2,989.86
  6. Step 6: Final answer
    x = 1,364.61

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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.