Home / 12,985.08-17,918.40-7,947.21

Finding the Fourth Proportional to 12,985.08, 17,918.40 and 7,947.21

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Solution

The fourth proportional to 12,985.08, 17,918.40 and 7,947.21 is: 10,966.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,985.08 : 17,918.40 = 7,947.21 : x
  2. Step 2: Convert to fraction form
    12,985.08/17,918.40 = 7,947.21/x
  3. Step 3: Cross multiply
    12,985.08x = 17,918.40 × 7,947.21
  4. Step 4: Simplify right side
    12,985.08x = 142,401,287.66
  5. Step 5: Solve for x
    x = 142,401,287.66/12,985.08
  6. Step 6: Final answer
    x = 10,966.53

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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.