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Finding the Fourth Proportional to 28,178.94, 38,886.94 and 15,603.69

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Solution

The fourth proportional to 28,178.94, 38,886.94 and 15,603.69 is: 21,533.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,178.94 : 38,886.94 = 15,603.69 : x
  2. Step 2: Convert to fraction form
    28,178.94/38,886.94 = 15,603.69/x
  3. Step 3: Cross multiply
    28,178.94x = 38,886.94 × 15,603.69
  4. Step 4: Simplify right side
    28,178.94x = 606,779,678.79
  5. Step 5: Solve for x
    x = 606,779,678.79/28,178.94
  6. Step 6: Final answer
    x = 21,533.09

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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.