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Finding the Fourth Proportional to 120,430.91, 180,812.21 and 61,307.79

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Solution

The fourth proportional to 120,430.91, 180,812.21 and 61,307.79 is: 92,046.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,430.91 : 180,812.21 = 61,307.79 : x
  2. Step 2: Convert to fraction form
    120,430.91/180,812.21 = 61,307.79/x
  3. Step 3: Cross multiply
    120,430.91x = 180,812.21 × 61,307.79
  4. Step 4: Simplify right side
    120,430.91x = 11,085,196,693.58
  5. Step 5: Solve for x
    x = 11,085,196,693.58/120,430.91
  6. Step 6: Final answer
    x = 92,046.11

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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.