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Finding the Fourth Proportional to 705.36, 973.68 and 638.67

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Solution

The fourth proportional to 705.36, 973.68 and 638.67 is: 881.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.36 : 973.68 = 638.67 : x
  2. Step 2: Convert to fraction form
    705.36/973.68 = 638.67/x
  3. Step 3: Cross multiply
    705.36x = 973.68 × 638.67
  4. Step 4: Simplify right side
    705.36x = 621,860.21
  5. Step 5: Solve for x
    x = 621,860.21/705.36
  6. Step 6: Final answer
    x = 881.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.