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Finding the Fourth Proportional to 107,985.60, 161,978.40 and 61,329.60

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Solution

The fourth proportional to 107,985.60, 161,978.40 and 61,329.60 is: 91,994.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,985.60 : 161,978.40 = 61,329.60 : x
  2. Step 2: Convert to fraction form
    107,985.60/161,978.40 = 61,329.60/x
  3. Step 3: Cross multiply
    107,985.60x = 161,978.40 × 61,329.60
  4. Step 4: Simplify right side
    107,985.60x = 9,934,070,480.64
  5. Step 5: Solve for x
    x = 9,934,070,480.64/107,985.60
  6. Step 6: Final answer
    x = 91,994.40

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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.