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Finding the Fourth Proportional to 4,917.60, 7,390.80 and 4,831.20

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Solution

The fourth proportional to 4,917.60, 7,390.80 and 4,831.20 is: 7,260.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,917.60 : 7,390.80 = 4,831.20 : x
  2. Step 2: Convert to fraction form
    4,917.60/7,390.80 = 4,831.20/x
  3. Step 3: Cross multiply
    4,917.60x = 7,390.80 × 4,831.20
  4. Step 4: Simplify right side
    4,917.60x = 35,706,432.96
  5. Step 5: Solve for x
    x = 35,706,432.96/4,917.60
  6. Step 6: Final answer
    x = 7,260.95

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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.