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Finding the Fourth Proportional to 7,779.40, 11,669.10 and 7,455.40

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Solution

The fourth proportional to 7,779.40, 11,669.10 and 7,455.40 is: 11,183.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,779.40 : 11,669.10 = 7,455.40 : x
  2. Step 2: Convert to fraction form
    7,779.40/11,669.10 = 7,455.40/x
  3. Step 3: Cross multiply
    7,779.40x = 11,669.10 × 7,455.40
  4. Step 4: Simplify right side
    7,779.40x = 86,997,808.14
  5. Step 5: Solve for x
    x = 86,997,808.14/7,779.40
  6. Step 6: Final answer
    x = 11,183.10

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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.