Home / 12,431.36-18,630.40-9,128.96

Finding the Fourth Proportional to 12,431.36, 18,630.40 and 9,128.96

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Solution

The fourth proportional to 12,431.36, 18,630.40 and 9,128.96 is: 13,681.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,431.36 : 18,630.40 = 9,128.96 : x
  2. Step 2: Convert to fraction form
    12,431.36/18,630.40 = 9,128.96/x
  3. Step 3: Cross multiply
    12,431.36x = 18,630.40 × 9,128.96
  4. Step 4: Simplify right side
    12,431.36x = 170,076,176.38
  5. Step 5: Solve for x
    x = 170,076,176.38/12,431.36
  6. Step 6: Final answer
    x = 13,681.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.