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Finding the Fourth Proportional to 65,309.19, 90,136.53 and 39,830.34

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Solution

The fourth proportional to 65,309.19, 90,136.53 and 39,830.34 is: 54,971.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,309.19 : 90,136.53 = 39,830.34 : x
  2. Step 2: Convert to fraction form
    65,309.19/90,136.53 = 39,830.34/x
  3. Step 3: Cross multiply
    65,309.19x = 90,136.53 × 39,830.34
  4. Step 4: Simplify right side
    65,309.19x = 3,590,168,636.32
  5. Step 5: Solve for x
    x = 3,590,168,636.32/65,309.19
  6. Step 6: Final answer
    x = 54,971.88

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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.