Home / 15,692.31-21,655.76-8,978.57

Finding the Fourth Proportional to 15,692.31, 21,655.76 and 8,978.57

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Solution

The fourth proportional to 15,692.31, 21,655.76 and 8,978.57 is: 12,390.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,692.31 : 21,655.76 = 8,978.57 : x
  2. Step 2: Convert to fraction form
    15,692.31/21,655.76 = 8,978.57/x
  3. Step 3: Cross multiply
    15,692.31x = 21,655.76 × 8,978.57
  4. Step 4: Simplify right side
    15,692.31x = 194,437,603.89
  5. Step 5: Solve for x
    x = 194,437,603.89/15,692.31
  6. Step 6: Final answer
    x = 12,390.63

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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.