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Finding the Fourth Proportional to 81,012.78, 111,779.74 and 47,001.57

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Solution

The fourth proportional to 81,012.78, 111,779.74 and 47,001.57 is: 64,851.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,012.78 : 111,779.74 = 47,001.57 : x
  2. Step 2: Convert to fraction form
    81,012.78/111,779.74 = 47,001.57/x
  3. Step 3: Cross multiply
    81,012.78x = 111,779.74 × 47,001.57
  4. Step 4: Simplify right side
    81,012.78x = 5,253,823,274.19
  5. Step 5: Solve for x
    x = 5,253,823,274.19/81,012.78
  6. Step 6: Final answer
    x = 64,851.78

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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.