Home / 108,688.85-149,921.57-78,518.51

Finding the Fourth Proportional to 108,688.85, 149,921.57 and 78,518.51

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Solution

The fourth proportional to 108,688.85, 149,921.57 and 78,518.51 is: 108,305.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,688.85 : 149,921.57 = 78,518.51 : x
  2. Step 2: Convert to fraction form
    108,688.85/149,921.57 = 78,518.51/x
  3. Step 3: Cross multiply
    108,688.85x = 149,921.57 × 78,518.51
  4. Step 4: Simplify right side
    108,688.85x = 11,771,617,739.95
  5. Step 5: Solve for x
    x = 11,771,617,739.95/108,688.85
  6. Step 6: Final answer
    x = 108,305.67

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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.