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Finding the Fourth Proportional to 861.45, 1,190.55 and 651.56

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Solution

The fourth proportional to 861.45, 1,190.55 and 651.56 is: 900.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.45 : 1,190.55 = 651.56 : x
  2. Step 2: Convert to fraction form
    861.45/1,190.55 = 651.56/x
  3. Step 3: Cross multiply
    861.45x = 1,190.55 × 651.56
  4. Step 4: Simplify right side
    861.45x = 775,714.28
  5. Step 5: Solve for x
    x = 775,714.28/861.45
  6. Step 6: Final answer
    x = 900.47

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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.