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Finding the Fourth Proportional to 109,418.80, 164,128.20 and 70,020.40

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Solution

The fourth proportional to 109,418.80, 164,128.20 and 70,020.40 is: 105,030.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,418.80 : 164,128.20 = 70,020.40 : x
  2. Step 2: Convert to fraction form
    109,418.80/164,128.20 = 70,020.40/x
  3. Step 3: Cross multiply
    109,418.80x = 164,128.20 × 70,020.40
  4. Step 4: Simplify right side
    109,418.80x = 11,492,322,215.28
  5. Step 5: Solve for x
    x = 11,492,322,215.28/109,418.80
  6. Step 6: Final answer
    x = 105,030.60

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1.5x scale

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.