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Finding the Fourth Proportional to 140,005.40, 210,008.10 and 100,639.40

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Solution

The fourth proportional to 140,005.40, 210,008.10 and 100,639.40 is: 150,959.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,005.40 : 210,008.10 = 100,639.40 : x
  2. Step 2: Convert to fraction form
    140,005.40/210,008.10 = 100,639.40/x
  3. Step 3: Cross multiply
    140,005.40x = 210,008.10 × 100,639.40
  4. Step 4: Simplify right side
    140,005.40x = 21,135,089,179.14
  5. Step 5: Solve for x
    x = 21,135,089,179.14/140,005.40
  6. Step 6: Final answer
    x = 150,959.10

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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.