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Finding the Fourth Proportional to 100,669.60, 151,004.40 and 90,647.20

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Solution

The fourth proportional to 100,669.60, 151,004.40 and 90,647.20 is: 135,970.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,669.60 : 151,004.40 = 90,647.20 : x
  2. Step 2: Convert to fraction form
    100,669.60/151,004.40 = 90,647.20/x
  3. Step 3: Cross multiply
    100,669.60x = 151,004.40 × 90,647.20
  4. Step 4: Simplify right side
    100,669.60x = 13,688,126,047.68
  5. Step 5: Solve for x
    x = 13,688,126,047.68/100,669.60
  6. Step 6: Final answer
    x = 135,970.80

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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.