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Finding the Fourth Proportional to 30,904.80, 46,312.80 and 19,211.20

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Solution

The fourth proportional to 30,904.80, 46,312.80 and 19,211.20 is: 28,789.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,904.80 : 46,312.80 = 19,211.20 : x
  2. Step 2: Convert to fraction form
    30,904.80/46,312.80 = 19,211.20/x
  3. Step 3: Cross multiply
    30,904.80x = 46,312.80 × 19,211.20
  4. Step 4: Simplify right side
    30,904.80x = 889,724,463.36
  5. Step 5: Solve for x
    x = 889,724,463.36/30,904.80
  6. Step 6: Final answer
    x = 28,789.20

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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.