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Finding the Fourth Proportional to 63,985.60, 95,978.40 and 19,619.20

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Solution

The fourth proportional to 63,985.60, 95,978.40 and 19,619.20 is: 29,428.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    63,985.60 : 95,978.40 = 19,619.20 : x
  2. Step 2: Convert to fraction form
    63,985.60/95,978.40 = 19,619.20/x
  3. Step 3: Cross multiply
    63,985.60x = 95,978.40 × 19,619.20
  4. Step 4: Simplify right side
    63,985.60x = 1,883,019,425.28
  5. Step 5: Solve for x
    x = 1,883,019,425.28/63,985.60
  6. Step 6: Final answer
    x = 29,428.80

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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.