Home / 128,985.60-193,478.40-89,619.60

Finding the Fourth Proportional to 128,985.60, 193,478.40 and 89,619.60

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Solution

The fourth proportional to 128,985.60, 193,478.40 and 89,619.60 is: 134,429.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,985.60 : 193,478.40 = 89,619.60 : x
  2. Step 2: Convert to fraction form
    128,985.60/193,478.40 = 89,619.60/x
  3. Step 3: Cross multiply
    128,985.60x = 193,478.40 × 89,619.60
  4. Step 4: Simplify right side
    128,985.60x = 17,339,456,816.64
  5. Step 5: Solve for x
    x = 17,339,456,816.64/128,985.60
  6. Step 6: Final answer
    x = 134,429.40

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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.