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Finding the Fourth Proportional to 315,390, 473,281.83 and 128,401.50

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Solution

The fourth proportional to 315,390, 473,281.83 and 128,401.50 is: 192,682.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,390 : 473,281.83 = 128,401.50 : x
  2. Step 2: Convert to fraction form
    315,390/473,281.83 = 128,401.50/x
  3. Step 3: Cross multiply
    315,390x = 473,281.83 × 128,401.50
  4. Step 4: Simplify right side
    315,390x = 60,770,096,894.75
  5. Step 5: Solve for x
    x = 60,770,096,894.75/315,390
  6. Step 6: Final answer
    x = 192,682.38

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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.