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Finding the Fourth Proportional to 65,987.65, 91,060.74 and 39,114.21

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Solution

The fourth proportional to 65,987.65, 91,060.74 and 39,114.21 is: 53,976.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,987.65 : 91,060.74 = 39,114.21 : x
  2. Step 2: Convert to fraction form
    65,987.65/91,060.74 = 39,114.21/x
  3. Step 3: Cross multiply
    65,987.65x = 91,060.74 × 39,114.21
  4. Step 4: Simplify right side
    65,987.65x = 3,561,768,907.12
  5. Step 5: Solve for x
    x = 3,561,768,907.12/65,987.65
  6. Step 6: Final answer
    x = 53,976.30

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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.