Home / 109,979.30-164,968.95-81,985.70

Finding the Fourth Proportional to 109,979.30, 164,968.95 and 81,985.70

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Solution

The fourth proportional to 109,979.30, 164,968.95 and 81,985.70 is: 122,978.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,979.30 : 164,968.95 = 81,985.70 : x
  2. Step 2: Convert to fraction form
    109,979.30/164,968.95 = 81,985.70/x
  3. Step 3: Cross multiply
    109,979.30x = 164,968.95 × 81,985.70
  4. Step 4: Simplify right side
    109,979.30x = 13,525,094,844.02
  5. Step 5: Solve for x
    x = 13,525,094,844.02/109,979.30
  6. Step 6: Final answer
    x = 122,978.55

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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.