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Finding the Fourth Proportional to 645.75, 891.10 and 351.02

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Solution

The fourth proportional to 645.75, 891.10 and 351.02 is: 484.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.75 : 891.10 = 351.02 : x
  2. Step 2: Convert to fraction form
    645.75/891.10 = 351.02/x
  3. Step 3: Cross multiply
    645.75x = 891.10 × 351.02
  4. Step 4: Simplify right side
    645.75x = 312,787.71
  5. Step 5: Solve for x
    x = 312,787.71/645.75
  6. Step 6: Final answer
    x = 484.38

Related Problems

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Half scale
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Double scale
Find fourth proportional to 646.75, 892.47 and 352.02
Similar ratio
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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.