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Finding the Fourth Proportional to 104,609.30, 156,683.55 and 90,785.30

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Solution

The fourth proportional to 104,609.30, 156,683.55 and 90,785.30 is: 135,978.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    104,609.30 : 156,683.55 = 90,785.30 : x
  2. Step 2: Convert to fraction form
    104,609.30/156,683.55 = 90,785.30/x
  3. Step 3: Cross multiply
    104,609.30x = 156,683.55 × 90,785.30
  4. Step 4: Simplify right side
    104,609.30x = 14,224,563,091.82
  5. Step 5: Solve for x
    x = 14,224,563,091.82/104,609.30
  6. Step 6: Final answer
    x = 135,978.00

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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.