Home / 6,421.05-9,631.61-1,978.66

Finding the Fourth Proportional to 6,421.05, 9,631.61 and 1,978.66

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Solution

The fourth proportional to 6,421.05, 9,631.61 and 1,978.66 is: 2,968.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,421.05 : 9,631.61 = 1,978.66 : x
  2. Step 2: Convert to fraction form
    6,421.05/9,631.61 = 1,978.66/x
  3. Step 3: Cross multiply
    6,421.05x = 9,631.61 × 1,978.66
  4. Step 4: Simplify right side
    6,421.05x = 19,057,681.44
  5. Step 5: Solve for x
    x = 19,057,681.44/6,421.05
  6. Step 6: Final answer
    x = 2,968.00

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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.