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Finding the Fourth Proportional to 28,978.40, 43,443.30 and 15,127.40

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Solution

The fourth proportional to 28,978.40, 43,443.30 and 15,127.40 is: 22,678.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978.40 : 43,443.30 = 15,127.40 : x
  2. Step 2: Convert to fraction form
    28,978.40/43,443.30 = 15,127.40/x
  3. Step 3: Cross multiply
    28,978.40x = 43,443.30 × 15,127.40
  4. Step 4: Simplify right side
    28,978.40x = 657,184,176.42
  5. Step 5: Solve for x
    x = 657,184,176.42/28,978.40
  6. Step 6: Final answer
    x = 22,678.41

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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.