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Finding the Fourth Proportional to 65,309.44, 90,136.88 and 39,830.59

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Solution

The fourth proportional to 65,309.44, 90,136.88 and 39,830.59 is: 54,972.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,309.44 : 90,136.88 = 39,830.59 : x
  2. Step 2: Convert to fraction form
    65,309.44/90,136.88 = 39,830.59/x
  3. Step 3: Cross multiply
    65,309.44x = 90,136.88 × 39,830.59
  4. Step 4: Simplify right side
    65,309.44x = 3,590,205,111.16
  5. Step 5: Solve for x
    x = 3,590,205,111.16/65,309.44
  6. Step 6: Final answer
    x = 54,972.22

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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.