Home / 15,420.39-21,280.15-8,346.79

Finding the Fourth Proportional to 15,420.39, 21,280.15 and 8,346.79

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Solution

The fourth proportional to 15,420.39, 21,280.15 and 8,346.79 is: 11,518.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,420.39 : 21,280.15 = 8,346.79 : x
  2. Step 2: Convert to fraction form
    15,420.39/21,280.15 = 8,346.79/x
  3. Step 3: Cross multiply
    15,420.39x = 21,280.15 × 8,346.79
  4. Step 4: Simplify right side
    15,420.39x = 177,620,943.22
  5. Step 5: Solve for x
    x = 177,620,943.22/15,420.39
  6. Step 6: Final answer
    x = 11,518.58

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Double scale
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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.