Home / 20,739-28,618.86-11,307.48

Finding the Fourth Proportional to 20,739, 28,618.86 and 11,307.48

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Solution

The fourth proportional to 20,739, 28,618.86 and 11,307.48 is: 15,603.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,739 : 28,618.86 = 11,307.48 : x
  2. Step 2: Convert to fraction form
    20,739/28,618.86 = 11,307.48/x
  3. Step 3: Cross multiply
    20,739x = 28,618.86 × 11,307.48
  4. Step 4: Simplify right side
    20,739x = 323,607,187.07
  5. Step 5: Solve for x
    x = 323,607,187.07/20,739
  6. Step 6: Final answer
    x = 15,603.80

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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.