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Finding the Fourth Proportional to 12,987.65, 17,922.91 and 7,019.32

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Solution

The fourth proportional to 12,987.65, 17,922.91 and 7,019.32 is: 9,686.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,987.65 : 17,922.91 = 7,019.32 : x
  2. Step 2: Convert to fraction form
    12,987.65/17,922.91 = 7,019.32/x
  3. Step 3: Cross multiply
    12,987.65x = 17,922.91 × 7,019.32
  4. Step 4: Simplify right side
    12,987.65x = 125,806,640.62
  5. Step 5: Solve for x
    x = 125,806,640.62/12,987.65
  6. Step 6: Final answer
    x = 9,686.64

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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.