Home / 812,372.89-1,120,721.64-489,903.79

Finding the Fourth Proportional to 812,372.89, 1,120,721.64 and 489,903.79

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Solution

The fourth proportional to 812,372.89, 1,120,721.64 and 489,903.79 is: 675,854.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    812,372.89 : 1,120,721.64 = 489,903.79 : x
  2. Step 2: Convert to fraction form
    812,372.89/1,120,721.64 = 489,903.79/x
  3. Step 3: Cross multiply
    812,372.89x = 1,120,721.64 × 489,903.79
  4. Step 4: Simplify right side
    812,372.89x = 549,045,773,367.41
  5. Step 5: Solve for x
    x = 549,045,773,367.41/812,372.89
  6. Step 6: Final answer
    x = 675,854.38

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Double scale
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Similar ratio
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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.