Home / 12,987.36-17,921.40-7,681.14

Finding the Fourth Proportional to 12,987.36, 17,921.40 and 7,681.14

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Solution

The fourth proportional to 12,987.36, 17,921.40 and 7,681.14 is: 10,599.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,987.36 : 17,921.40 = 7,681.14 : x
  2. Step 2: Convert to fraction form
    12,987.36/17,921.40 = 7,681.14/x
  3. Step 3: Cross multiply
    12,987.36x = 17,921.40 × 7,681.14
  4. Step 4: Simplify right side
    12,987.36x = 137,656,782.40
  5. Step 5: Solve for x
    x = 137,656,782.40/12,987.36
  6. Step 6: Final answer
    x = 10,599.29

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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.