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Finding the Fourth Proportional to 35,328.54, 48,731.79 and 20,978.64

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Solution

The fourth proportional to 35,328.54, 48,731.79 and 20,978.64 is: 28,937.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    35,328.54 : 48,731.79 = 20,978.64 : x
  2. Step 2: Convert to fraction form
    35,328.54/48,731.79 = 20,978.64/x
  3. Step 3: Cross multiply
    35,328.54x = 48,731.79 × 20,978.64
  4. Step 4: Simplify right side
    35,328.54x = 1,022,326,678.97
  5. Step 5: Solve for x
    x = 1,022,326,678.97/35,328.54
  6. Step 6: Final answer
    x = 28,937.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.