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Finding the Fourth Proportional to 620,408.20, 930,612.30 and 407,831.80

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Solution

The fourth proportional to 620,408.20, 930,612.30 and 407,831.80 is: 611,747.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,408.20 : 930,612.30 = 407,831.80 : x
  2. Step 2: Convert to fraction form
    620,408.20/930,612.30 = 407,831.80/x
  3. Step 3: Cross multiply
    620,408.20x = 930,612.30 × 407,831.80
  4. Step 4: Simplify right side
    620,408.20x = 379,533,289,411.14
  5. Step 5: Solve for x
    x = 379,533,289,411.14/620,408.20
  6. Step 6: Final answer
    x = 611,747.70

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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.