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Finding the Fourth Proportional to 515.81, 711.90 and 385.19

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Solution

The fourth proportional to 515.81, 711.90 and 385.19 is: 531.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.81 : 711.90 = 385.19 : x
  2. Step 2: Convert to fraction form
    515.81/711.90 = 385.19/x
  3. Step 3: Cross multiply
    515.81x = 711.90 × 385.19
  4. Step 4: Simplify right side
    515.81x = 274,216.76
  5. Step 5: Solve for x
    x = 274,216.76/515.81
  6. Step 6: Final answer
    x = 531.62

Related Problems

Find fourth proportional to 257.91, 355.95 and 192.60
Half scale
Find fourth proportional to 1,031.62, 1,423.80 and 770.38
Double scale
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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.