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Finding the Fourth Proportional to 45,808.40, 68,712.60 and 20,848.40

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Solution

The fourth proportional to 45,808.40, 68,712.60 and 20,848.40 is: 31,272.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,808.40 : 68,712.60 = 20,848.40 : x
  2. Step 2: Convert to fraction form
    45,808.40/68,712.60 = 20,848.40/x
  3. Step 3: Cross multiply
    45,808.40x = 68,712.60 × 20,848.40
  4. Step 4: Simplify right side
    45,808.40x = 1,432,547,769.84
  5. Step 5: Solve for x
    x = 1,432,547,769.84/45,808.40
  6. Step 6: Final answer
    x = 31,272.60

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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.