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Finding the Fourth Proportional to 975.42, 1,346.70 and 712.98

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Solution

The fourth proportional to 975.42, 1,346.70 and 712.98 is: 984.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.42 : 1,346.70 = 712.98 : x
  2. Step 2: Convert to fraction form
    975.42/1,346.70 = 712.98/x
  3. Step 3: Cross multiply
    975.42x = 1,346.70 × 712.98
  4. Step 4: Simplify right side
    975.42x = 960,170.17
  5. Step 5: Solve for x
    x = 960,170.17/975.42
  6. Step 6: Final answer
    x = 984.37

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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.