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Finding the Fourth Proportional to 28,710.40, 42,968.40 and 25,211.20

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Solution

The fourth proportional to 28,710.40, 42,968.40 and 25,211.20 is: 37,731.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,710.40 : 42,968.40 = 25,211.20 : x
  2. Step 2: Convert to fraction form
    28,710.40/42,968.40 = 25,211.20/x
  3. Step 3: Cross multiply
    28,710.40x = 42,968.40 × 25,211.20
  4. Step 4: Simplify right side
    28,710.40x = 1,083,284,926.08
  5. Step 5: Solve for x
    x = 1,083,284,926.08/28,710.40
  6. Step 6: Final answer
    x = 37,731.45

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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.