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Finding the Fourth Proportional to 553.43, 763.72 and 304.75

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Solution

The fourth proportional to 553.43, 763.72 and 304.75 is: 420.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.43 : 763.72 = 304.75 : x
  2. Step 2: Convert to fraction form
    553.43/763.72 = 304.75/x
  3. Step 3: Cross multiply
    553.43x = 763.72 × 304.75
  4. Step 4: Simplify right side
    553.43x = 232,743.67
  5. Step 5: Solve for x
    x = 232,743.67/553.43
  6. Step 6: Final answer
    x = 420.55

Related Problems

Find fourth proportional to 276.72, 381.86 and 152.38
Half scale
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Double scale
Find fourth proportional to 554.43, 765.10 and 305.75
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.