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Finding the Fourth Proportional to 28,402, 39,179.85 and 21,675.91

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Solution

The fourth proportional to 28,402, 39,179.85 and 21,675.91 is: 29,901.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,402 : 39,179.85 = 21,675.91 : x
  2. Step 2: Convert to fraction form
    28,402/39,179.85 = 21,675.91/x
  3. Step 3: Cross multiply
    28,402x = 39,179.85 × 21,675.91
  4. Step 4: Simplify right side
    28,402x = 849,258,902.41
  5. Step 5: Solve for x
    x = 849,258,902.41/28,402
  6. Step 6: Final answer
    x = 29,901.38

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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.