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Finding the Fourth Proportional to 139,970.20, 210,020.10 and 73,485.40

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Solution

The fourth proportional to 139,970.20, 210,020.10 and 73,485.40 is: 110,262.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,970.20 : 210,020.10 = 73,485.40 : x
  2. Step 2: Convert to fraction form
    139,970.20/210,020.10 = 73,485.40/x
  3. Step 3: Cross multiply
    139,970.20x = 210,020.10 × 73,485.40
  4. Step 4: Simplify right side
    139,970.20x = 15,433,411,056.54
  5. Step 5: Solve for x
    x = 15,433,411,056.54/139,970.20
  6. Step 6: Final answer
    x = 110,262.12

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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.