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Finding the Fourth Proportional to 1,005.92, 1,506 and 639.84

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Solution

The fourth proportional to 1,005.92, 1,506 and 639.84 is: 957.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.92 : 1,506 = 639.84 : x
  2. Step 2: Convert to fraction form
    1,005.92/1,506 = 639.84/x
  3. Step 3: Cross multiply
    1,005.92x = 1,506 × 639.84
  4. Step 4: Simplify right side
    1,005.92x = 963,599.04
  5. Step 5: Solve for x
    x = 963,599.04/1,005.92
  6. Step 6: Final answer
    x = 957.93

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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.