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Finding the Fourth Proportional to 712.45, 1,070.70 and 623.35

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Solution

The fourth proportional to 712.45, 1,070.70 and 623.35 is: 936.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.45 : 1,070.70 = 623.35 : x
  2. Step 2: Convert to fraction form
    712.45/1,070.70 = 623.35/x
  3. Step 3: Cross multiply
    712.45x = 1,070.70 × 623.35
  4. Step 4: Simplify right side
    712.45x = 667,420.85
  5. Step 5: Solve for x
    x = 667,420.85/712.45
  6. Step 6: Final answer
    x = 936.80

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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.