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Finding the Fourth Proportional to 645.48, 890.74 and 350.75

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Solution

The fourth proportional to 645.48, 890.74 and 350.75 is: 484.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.48 : 890.74 = 350.75 : x
  2. Step 2: Convert to fraction form
    645.48/890.74 = 350.75/x
  3. Step 3: Cross multiply
    645.48x = 890.74 × 350.75
  4. Step 4: Simplify right side
    645.48x = 312,427.06
  5. Step 5: Solve for x
    x = 312,427.06/645.48
  6. Step 6: Final answer
    x = 484.02

Related Problems

Find fourth proportional to 322.74, 445.37 and 175.38
Half scale
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Double scale
Find fourth proportional to 646.48, 892.12 and 351.75
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.