Home / 11,456.39-15,810.79-6,420.55

Finding the Fourth Proportional to 11,456.39, 15,810.79 and 6,420.55

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Solution

The fourth proportional to 11,456.39, 15,810.79 and 6,420.55 is: 8,860.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,456.39 : 15,810.79 = 6,420.55 : x
  2. Step 2: Convert to fraction form
    11,456.39/15,810.79 = 6,420.55/x
  3. Step 3: Cross multiply
    11,456.39x = 15,810.79 × 6,420.55
  4. Step 4: Simplify right side
    11,456.39x = 101,513,967.73
  5. Step 5: Solve for x
    x = 101,513,967.73/11,456.39
  6. Step 6: Final answer
    x = 8,860.90

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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.