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Finding the Fourth Proportional to 1,156.96, 1,595.28 and 861.28

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Solution

The fourth proportional to 1,156.96, 1,595.28 and 861.28 is: 1,187.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,156.96 : 1,595.28 = 861.28 : x
  2. Step 2: Convert to fraction form
    1,156.96/1,595.28 = 861.28/x
  3. Step 3: Cross multiply
    1,156.96x = 1,595.28 × 861.28
  4. Step 4: Simplify right side
    1,156.96x = 1,373,982.76
  5. Step 5: Solve for x
    x = 1,373,982.76/1,156.96
  6. Step 6: Final answer
    x = 1,187.58

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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.