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Finding the Fourth Proportional to 678.85, 941.09 and 656.17

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Solution

The fourth proportional to 678.85, 941.09 and 656.17 is: 909.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.85 : 941.09 = 656.17 : x
  2. Step 2: Convert to fraction form
    678.85/941.09 = 656.17/x
  3. Step 3: Cross multiply
    678.85x = 941.09 × 656.17
  4. Step 4: Simplify right side
    678.85x = 617,509.39
  5. Step 5: Solve for x
    x = 617,509.39/678.85
  6. Step 6: Final answer
    x = 909.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.