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Finding the Fourth Proportional to 18,762.55, 28,129.78 and 6,275.32

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Solution

The fourth proportional to 18,762.55, 28,129.78 and 6,275.32 is: 9,408.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,762.55 : 28,129.78 = 6,275.32 : x
  2. Step 2: Convert to fraction form
    18,762.55/28,129.78 = 6,275.32/x
  3. Step 3: Cross multiply
    18,762.55x = 28,129.78 × 6,275.32
  4. Step 4: Simplify right side
    18,762.55x = 176,523,371.03
  5. Step 5: Solve for x
    x = 176,523,371.03/18,762.55
  6. Step 6: Final answer
    x = 9,408.28

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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.