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Finding the Fourth Proportional to 120,450.78, 180,430.79 and 57,078.81

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Solution

The fourth proportional to 120,450.78, 180,430.79 and 57,078.81 is: 85,501.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,450.78 : 180,430.79 = 57,078.81 : x
  2. Step 2: Convert to fraction form
    120,450.78/180,430.79 = 57,078.81/x
  3. Step 3: Cross multiply
    120,450.78x = 180,430.79 × 57,078.81
  4. Step 4: Simplify right side
    120,450.78x = 10,298,774,495.17
  5. Step 5: Solve for x
    x = 10,298,774,495.17/120,450.78
  6. Step 6: Final answer
    x = 85,501.93

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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.