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Finding the Fourth Proportional to 103,507.20, 155,260.80 and 72,014.40

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Solution

The fourth proportional to 103,507.20, 155,260.80 and 72,014.40 is: 108,021.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,507.20 : 155,260.80 = 72,014.40 : x
  2. Step 2: Convert to fraction form
    103,507.20/155,260.80 = 72,014.40/x
  3. Step 3: Cross multiply
    103,507.20x = 155,260.80 × 72,014.40
  4. Step 4: Simplify right side
    103,507.20x = 11,181,013,355.52
  5. Step 5: Solve for x
    x = 11,181,013,355.52/103,507.20
  6. Step 6: Final answer
    x = 108,021.60

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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.