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Finding the Fourth Proportional to 354,776.58, 489,999 and 258,409.80

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Solution

The fourth proportional to 354,776.58, 489,999 and 258,409.80 is: 356,902.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    354,776.58 : 489,999 = 258,409.80 : x
  2. Step 2: Convert to fraction form
    354,776.58/489,999 = 258,409.80/x
  3. Step 3: Cross multiply
    354,776.58x = 489,999 × 258,409.80
  4. Step 4: Simplify right side
    354,776.58x = 126,620,543,590.20
  5. Step 5: Solve for x
    x = 126,620,543,590.20/354,776.58
  6. Step 6: Final answer
    x = 356,902.20

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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.