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Finding the Fourth Proportional to 12,960, 19,442.88 and 4,752

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Solution

The fourth proportional to 12,960, 19,442.88 and 4,752 is: 7,129.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,960 : 19,442.88 = 4,752 : x
  2. Step 2: Convert to fraction form
    12,960/19,442.88 = 4,752/x
  3. Step 3: Cross multiply
    12,960x = 19,442.88 × 4,752
  4. Step 4: Simplify right side
    12,960x = 92,392,565.76
  5. Step 5: Solve for x
    x = 92,392,565.76/12,960
  6. Step 6: Final answer
    x = 7,129.06

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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.