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Finding the Fourth Proportional to 711.84, 975.21 and 687.18

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Solution

The fourth proportional to 711.84, 975.21 and 687.18 is: 941.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.84 : 975.21 = 687.18 : x
  2. Step 2: Convert to fraction form
    711.84/975.21 = 687.18/x
  3. Step 3: Cross multiply
    711.84x = 975.21 × 687.18
  4. Step 4: Simplify right side
    711.84x = 670,144.81
  5. Step 5: Solve for x
    x = 670,144.81/711.84
  6. Step 6: Final answer
    x = 941.43

Related Problems

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.