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Finding the Fourth Proportional to 548.76, 757.30 and 315.90

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Solution

The fourth proportional to 548.76, 757.30 and 315.90 is: 435.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.76 : 757.30 = 315.90 : x
  2. Step 2: Convert to fraction form
    548.76/757.30 = 315.90/x
  3. Step 3: Cross multiply
    548.76x = 757.30 × 315.90
  4. Step 4: Simplify right side
    548.76x = 239,231.07
  5. Step 5: Solve for x
    x = 239,231.07/548.76
  6. Step 6: Final answer
    x = 435.95

Related Problems

Find fourth proportional to 274.38, 378.65 and 157.95
Half scale
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Double scale
Find fourth proportional to 549.76, 758.68 and 316.90
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.