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Finding the Fourth Proportional to 489,879.48, 675,987 and 274,970.28

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Solution

The fourth proportional to 489,879.48, 675,987 and 274,970.28 is: 379,432.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,879.48 : 675,987 = 274,970.28 : x
  2. Step 2: Convert to fraction form
    489,879.48/675,987 = 274,970.28/x
  3. Step 3: Cross multiply
    489,879.48x = 675,987 × 274,970.28
  4. Step 4: Simplify right side
    489,879.48x = 185,876,334,666.36
  5. Step 5: Solve for x
    x = 185,876,334,666.36/489,879.48
  6. Step 6: Final answer
    x = 379,432.78

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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.