Home / 15,378.78-21,220.36-8,663.98

Finding the Fourth Proportional to 15,378.78, 21,220.36 and 8,663.98

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Solution

The fourth proportional to 15,378.78, 21,220.36 and 8,663.98 is: 11,954.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,378.78 : 21,220.36 = 8,663.98 : x
  2. Step 2: Convert to fraction form
    15,378.78/21,220.36 = 8,663.98/x
  3. Step 3: Cross multiply
    15,378.78x = 21,220.36 × 8,663.98
  4. Step 4: Simplify right side
    15,378.78x = 183,852,774.63
  5. Step 5: Solve for x
    x = 183,852,774.63/15,378.78
  6. Step 6: Final answer
    x = 11,954.96

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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.