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Finding the Fourth Proportional to 707.63, 1,055.28 and 628.96

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Solution

The fourth proportional to 707.63, 1,055.28 and 628.96 is: 937.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.63 : 1,055.28 = 628.96 : x
  2. Step 2: Convert to fraction form
    707.63/1,055.28 = 628.96/x
  3. Step 3: Cross multiply
    707.63x = 1,055.28 × 628.96
  4. Step 4: Simplify right side
    707.63x = 663,730.61
  5. Step 5: Solve for x
    x = 663,730.61/707.63
  6. Step 6: Final answer
    x = 937.96

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.