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Finding the Fourth Proportional to 870.70, 1,200.75 and 694.25

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Solution

The fourth proportional to 870.70, 1,200.75 and 694.25 is: 957.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.70 : 1,200.75 = 694.25 : x
  2. Step 2: Convert to fraction form
    870.70/1,200.75 = 694.25/x
  3. Step 3: Cross multiply
    870.70x = 1,200.75 × 694.25
  4. Step 4: Simplify right side
    870.70x = 833,620.49
  5. Step 5: Solve for x
    x = 833,620.49/870.70
  6. Step 6: Final answer
    x = 957.41

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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.