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Finding the Fourth Proportional to 128,492.04, 177,321.11 and 70,347.80

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Solution

The fourth proportional to 128,492.04, 177,321.11 and 70,347.80 is: 97,081.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,492.04 : 177,321.11 = 70,347.80 : x
  2. Step 2: Convert to fraction form
    128,492.04/177,321.11 = 70,347.80/x
  3. Step 3: Cross multiply
    128,492.04x = 177,321.11 × 70,347.80
  4. Step 4: Simplify right side
    128,492.04x = 12,474,149,982.06
  5. Step 5: Solve for x
    x = 12,474,149,982.06/128,492.04
  6. Step 6: Final answer
    x = 97,081.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.