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Finding the Fourth Proportional to 31,200, 46,800 and 9,312

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Solution

The fourth proportional to 31,200, 46,800 and 9,312 is: 13,968

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,200 : 46,800 = 9,312 : x
  2. Step 2: Convert to fraction form
    31,200/46,800 = 9,312/x
  3. Step 3: Cross multiply
    31,200x = 46,800 × 9,312
  4. Step 4: Simplify right side
    31,200x = 435,801,600
  5. Step 5: Solve for x
    x = 435,801,600/31,200
  6. Step 6: Final answer
    x = 13,968

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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.