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Finding the Fourth Proportional to 43,420.47, 65,130.71 and 12,255.72

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Solution

The fourth proportional to 43,420.47, 65,130.71 and 12,255.72 is: 18,383.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,420.47 : 65,130.71 = 12,255.72 : x
  2. Step 2: Convert to fraction form
    43,420.47/65,130.71 = 12,255.72/x
  3. Step 3: Cross multiply
    43,420.47x = 65,130.71 × 12,255.72
  4. Step 4: Simplify right side
    43,420.47x = 798,223,683.88
  5. Step 5: Solve for x
    x = 798,223,683.88/43,420.47
  6. Step 6: Final answer
    x = 18,383.58

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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.