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Finding the Fourth Proportional to 890.15, 1,228.18 and 554.32

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Solution

The fourth proportional to 890.15, 1,228.18 and 554.32 is: 764.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.15 : 1,228.18 = 554.32 : x
  2. Step 2: Convert to fraction form
    890.15/1,228.18 = 554.32/x
  3. Step 3: Cross multiply
    890.15x = 1,228.18 × 554.32
  4. Step 4: Simplify right side
    890.15x = 680,799.98
  5. Step 5: Solve for x
    x = 680,799.98/890.15
  6. Step 6: Final answer
    x = 764.81

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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.