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Finding the Fourth Proportional to 28,179, 38,889.86 and 15,603.75

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Solution

The fourth proportional to 28,179, 38,889.86 and 15,603.75 is: 21,534.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,179 : 38,889.86 = 15,603.75 : x
  2. Step 2: Convert to fraction form
    28,179/38,889.86 = 15,603.75/x
  3. Step 3: Cross multiply
    28,179x = 38,889.86 × 15,603.75
  4. Step 4: Simplify right side
    28,179x = 606,827,574.96
  5. Step 5: Solve for x
    x = 606,827,574.96/28,179
  6. Step 6: Final answer
    x = 21,534.74

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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.