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Finding the Fourth Proportional to 548.10, 756.20 and 390.76

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Solution

The fourth proportional to 548.10, 756.20 and 390.76 is: 539.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.10 : 756.20 = 390.76 : x
  2. Step 2: Convert to fraction form
    548.10/756.20 = 390.76/x
  3. Step 3: Cross multiply
    548.10x = 756.20 × 390.76
  4. Step 4: Simplify right side
    548.10x = 295,491.80
  5. Step 5: Solve for x
    x = 295,491.80/548.10
  6. Step 6: Final answer
    x = 539.12

Related Problems

Find fourth proportional to 274.05, 378.10 and 195.38
Half scale
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Double scale
Find fourth proportional to 549.10, 757.58 and 391.76
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.