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Finding the Fourth Proportional to 8,555.78, 11,779.53 and 7,451.30

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Solution

The fourth proportional to 8,555.78, 11,779.53 and 7,451.30 is: 10,258.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,555.78 : 11,779.53 = 7,451.30 : x
  2. Step 2: Convert to fraction form
    8,555.78/11,779.53 = 7,451.30/x
  3. Step 3: Cross multiply
    8,555.78x = 11,779.53 × 7,451.30
  4. Step 4: Simplify right side
    8,555.78x = 87,772,811.89
  5. Step 5: Solve for x
    x = 87,772,811.89/8,555.78
  6. Step 6: Final answer
    x = 10,258.89

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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.