Home / 15,420.09-21,279.75-8,346.51

Finding the Fourth Proportional to 15,420.09, 21,279.75 and 8,346.51

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Solution

The fourth proportional to 15,420.09, 21,279.75 and 8,346.51 is: 11,518.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,420.09 : 21,279.75 = 8,346.51 : x
  2. Step 2: Convert to fraction form
    15,420.09/21,279.75 = 8,346.51/x
  3. Step 3: Cross multiply
    15,420.09x = 21,279.75 × 8,346.51
  4. Step 4: Simplify right side
    15,420.09x = 177,611,646.17
  5. Step 5: Solve for x
    x = 177,611,646.17/15,420.09
  6. Step 6: Final answer
    x = 11,518.20

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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.