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Finding the Fourth Proportional to 539.20, 744.12 and 315.19

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Solution

The fourth proportional to 539.20, 744.12 and 315.19 is: 434.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.20 : 744.12 = 315.19 : x
  2. Step 2: Convert to fraction form
    539.20/744.12 = 315.19/x
  3. Step 3: Cross multiply
    539.20x = 744.12 × 315.19
  4. Step 4: Simplify right side
    539.20x = 234,539.18
  5. Step 5: Solve for x
    x = 234,539.18/539.20
  6. Step 6: Final answer
    x = 434.98

Related Problems

Find fourth proportional to 269.60, 372.06 and 157.60
Half scale
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Double scale
Find fourth proportional to 540.20, 745.50 and 316.19
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.