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Finding the Fourth Proportional to 6,470.70, 8,931.87 and 3,920.46

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Solution

The fourth proportional to 6,470.70, 8,931.87 and 3,920.46 is: 5,411.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,470.70 : 8,931.87 = 3,920.46 : x
  2. Step 2: Convert to fraction form
    6,470.70/8,931.87 = 3,920.46/x
  3. Step 3: Cross multiply
    6,470.70x = 8,931.87 × 3,920.46
  4. Step 4: Simplify right side
    6,470.70x = 35,017,039.06
  5. Step 5: Solve for x
    x = 35,017,039.06/6,470.70
  6. Step 6: Final answer
    x = 5,411.63

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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.