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Finding the Fourth Proportional to 705.84, 1,056.45 and 638.47

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Solution

The fourth proportional to 705.84, 1,056.45 and 638.47 is: 955.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.84 : 1,056.45 = 638.47 : x
  2. Step 2: Convert to fraction form
    705.84/1,056.45 = 638.47/x
  3. Step 3: Cross multiply
    705.84x = 1,056.45 × 638.47
  4. Step 4: Simplify right side
    705.84x = 674,511.63
  5. Step 5: Solve for x
    x = 674,511.63/705.84
  6. Step 6: Final answer
    x = 955.62

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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.