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Finding the Fourth Proportional to 312,432,879.80, 468,649,319.70 and 261,792,457.40

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Solution

The fourth proportional to 312,432,879.80, 468,649,319.70 and 261,792,457.40 is: 392,688,686.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,432,879.80 : 468,649,319.70 = 261,792,457.40 : x
  2. Step 2: Convert to fraction form
    312,432,879.80/468,649,319.70 = 261,792,457.40/x
  3. Step 3: Cross multiply
    312,432,879.80x = 468,649,319.70 × 261,792,457.40
  4. Step 4: Simplify right side
    312,432,879.80x = 122,688,857,063,101,232
  5. Step 5: Solve for x
    x = 122,688,857,063,101,232/312,432,879.80
  6. Step 6: Final answer
    x = 392,688,686.10

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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.