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Finding the Fourth Proportional to 53,978.95, 80,965.86 and 18,915.94

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Solution

The fourth proportional to 53,978.95, 80,965.86 and 18,915.94 is: 28,373.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,978.95 : 80,965.86 = 18,915.94 : x
  2. Step 2: Convert to fraction form
    53,978.95/80,965.86 = 18,915.94/x
  3. Step 3: Cross multiply
    53,978.95x = 80,965.86 × 18,915.94
  4. Step 4: Simplify right side
    53,978.95x = 1,531,545,349.81
  5. Step 5: Solve for x
    x = 1,531,545,349.81/53,978.95
  6. Step 6: Final answer
    x = 28,373.01

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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.