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Finding the Fourth Proportional to 890.96, 1,228.88 and 654.98

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Solution

The fourth proportional to 890.96, 1,228.88 and 654.98 is: 903.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.96 : 1,228.88 = 654.98 : x
  2. Step 2: Convert to fraction form
    890.96/1,228.88 = 654.98/x
  3. Step 3: Cross multiply
    890.96x = 1,228.88 × 654.98
  4. Step 4: Simplify right side
    890.96x = 804,887.32
  5. Step 5: Solve for x
    x = 804,887.32/890.96
  6. Step 6: Final answer
    x = 903.40

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Double scale
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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.