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Finding the Fourth Proportional to 318,676.11, 478,030.05 and 91,005.51

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Solution

The fourth proportional to 318,676.11, 478,030.05 and 91,005.51 is: 136,512.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,676.11 : 478,030.05 = 91,005.51 : x
  2. Step 2: Convert to fraction form
    318,676.11/478,030.05 = 91,005.51/x
  3. Step 3: Cross multiply
    318,676.11x = 478,030.05 × 91,005.51
  4. Step 4: Simplify right side
    318,676.11x = 43,503,368,495.58
  5. Step 5: Solve for x
    x = 43,503,368,495.58/318,676.11
  6. Step 6: Final answer
    x = 136,512.80

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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.