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Finding the Fourth Proportional to 869.40, 1,191.15 and 857.25

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Solution

The fourth proportional to 869.40, 1,191.15 and 857.25 is: 1,174.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.40 : 1,191.15 = 857.25 : x
  2. Step 2: Convert to fraction form
    869.40/1,191.15 = 857.25/x
  3. Step 3: Cross multiply
    869.40x = 1,191.15 × 857.25
  4. Step 4: Simplify right side
    869.40x = 1,021,113.34
  5. Step 5: Solve for x
    x = 1,021,113.34/869.40
  6. Step 6: Final answer
    x = 1,174.50

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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.