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Finding the Fourth Proportional to 2,165.76, 3,248.88 and 705

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Solution

The fourth proportional to 2,165.76, 3,248.88 and 705 is: 1,057.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,165.76 : 3,248.88 = 705 : x
  2. Step 2: Convert to fraction form
    2,165.76/3,248.88 = 705/x
  3. Step 3: Cross multiply
    2,165.76x = 3,248.88 × 705
  4. Step 4: Simplify right side
    2,165.76x = 2,290,460.40
  5. Step 5: Solve for x
    x = 2,290,460.40/2,165.76
  6. Step 6: Final answer
    x = 1,057.58

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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.