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Finding the Fourth Proportional to 489,085.90, 685,420.10 and 489,085.90

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Solution

The fourth proportional to 489,085.90, 685,420.10 and 489,085.90 is: 685,420.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,085.90 : 685,420.10 = 489,085.90 : x
  2. Step 2: Convert to fraction form
    489,085.90/685,420.10 = 489,085.90/x
  3. Step 3: Cross multiply
    489,085.90x = 685,420.10 × 489,085.90
  4. Step 4: Simplify right side
    489,085.90x = 335,229,306,486.59
  5. Step 5: Solve for x
    x = 335,229,306,486.59/489,085.90
  6. Step 6: Final answer
    x = 685,420.10

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.