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Finding the Fourth Proportional to 12,987.60, 17,918.58 and 7,321.65

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Solution

The fourth proportional to 12,987.60, 17,918.58 and 7,321.65 is: 10,101.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,987.60 : 17,918.58 = 7,321.65 : x
  2. Step 2: Convert to fraction form
    12,987.60/17,918.58 = 7,321.65/x
  3. Step 3: Cross multiply
    12,987.60x = 17,918.58 × 7,321.65
  4. Step 4: Simplify right side
    12,987.60x = 131,193,571.26
  5. Step 5: Solve for x
    x = 131,193,571.26/12,987.60
  6. Step 6: Final answer
    x = 10,101.45

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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.