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Finding the Fourth Proportional to 18,978.86, 28,461.54 and 7,130.18

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Solution

The fourth proportional to 18,978.86, 28,461.54 and 7,130.18 is: 10,692.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.86 : 28,461.54 = 7,130.18 : x
  2. Step 2: Convert to fraction form
    18,978.86/28,461.54 = 7,130.18/x
  3. Step 3: Cross multiply
    18,978.86x = 28,461.54 × 7,130.18
  4. Step 4: Simplify right side
    18,978.86x = 202,935,903.28
  5. Step 5: Solve for x
    x = 202,935,903.28/18,978.86
  6. Step 6: Final answer
    x = 10,692.73

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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.