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Finding the Fourth Proportional to 108,355.86, 149,451.21 and 78,240.60

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Solution

The fourth proportional to 108,355.86, 149,451.21 and 78,240.60 is: 107,914.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,355.86 : 149,451.21 = 78,240.60 : x
  2. Step 2: Convert to fraction form
    108,355.86/149,451.21 = 78,240.60/x
  3. Step 3: Cross multiply
    108,355.86x = 149,451.21 × 78,240.60
  4. Step 4: Simplify right side
    108,355.86x = 11,693,152,341.13
  5. Step 5: Solve for x
    x = 11,693,152,341.13/108,355.86
  6. Step 6: Final answer
    x = 107,914.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.