Home / 12,921.48-17,840.20-9,931.80

Finding the Fourth Proportional to 12,921.48, 17,840.20 and 9,931.80

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Solution

The fourth proportional to 12,921.48, 17,840.20 and 9,931.80 is: 13,712.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,921.48 : 17,840.20 = 9,931.80 : x
  2. Step 2: Convert to fraction form
    12,921.48/17,840.20 = 9,931.80/x
  3. Step 3: Cross multiply
    12,921.48x = 17,840.20 × 9,931.80
  4. Step 4: Simplify right side
    12,921.48x = 177,185,298.36
  5. Step 5: Solve for x
    x = 177,185,298.36/12,921.48
  6. Step 6: Final answer
    x = 13,712.46

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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.