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Finding the Fourth Proportional to 25,440, 38,160.72 and 6,972

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Solution

The fourth proportional to 25,440, 38,160.72 and 6,972 is: 10,458.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,440 : 38,160.72 = 6,972 : x
  2. Step 2: Convert to fraction form
    25,440/38,160.72 = 6,972/x
  3. Step 3: Cross multiply
    25,440x = 38,160.72 × 6,972
  4. Step 4: Simplify right side
    25,440x = 266,056,539.84
  5. Step 5: Solve for x
    x = 266,056,539.84/25,440
  6. Step 6: Final answer
    x = 10,458.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.