Home / 12,985.60-17,921.78-8,513.12

Finding the Fourth Proportional to 12,985.60, 17,921.78 and 8,513.12

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Solution

The fourth proportional to 12,985.60, 17,921.78 and 8,513.12 is: 11,749.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,985.60 : 17,921.78 = 8,513.12 : x
  2. Step 2: Convert to fraction form
    12,985.60/17,921.78 = 8,513.12/x
  3. Step 3: Cross multiply
    12,985.60x = 17,921.78 × 8,513.12
  4. Step 4: Simplify right side
    12,985.60x = 152,570,263.75
  5. Step 5: Solve for x
    x = 152,570,263.75/12,985.60
  6. Step 6: Final answer
    x = 11,749.19

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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.