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Finding the Fourth Proportional to 12,438.55, 18,655.05 and 7,501.39

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Solution

The fourth proportional to 12,438.55, 18,655.05 and 7,501.39 is: 11,250.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,438.55 : 18,655.05 = 7,501.39 : x
  2. Step 2: Convert to fraction form
    12,438.55/18,655.05 = 7,501.39/x
  3. Step 3: Cross multiply
    12,438.55x = 18,655.05 × 7,501.39
  4. Step 4: Simplify right side
    12,438.55x = 139,938,805.52
  5. Step 5: Solve for x
    x = 139,938,805.52/12,438.55
  6. Step 6: Final answer
    x = 11,250.41

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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.