Home / 12,985.39-17,915.64-7,944.36

Finding the Fourth Proportional to 12,985.39, 17,915.64 and 7,944.36

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Solution

The fourth proportional to 12,985.39, 17,915.64 and 7,944.36 is: 10,960.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,985.39 : 17,915.64 = 7,944.36 : x
  2. Step 2: Convert to fraction form
    12,985.39/17,915.64 = 7,944.36/x
  3. Step 3: Cross multiply
    12,985.39x = 17,915.64 × 7,944.36
  4. Step 4: Simplify right side
    12,985.39x = 142,328,209.28
  5. Step 5: Solve for x
    x = 142,328,209.28/12,985.39
  6. Step 6: Final answer
    x = 10,960.64

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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.