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Finding the Fourth Proportional to 559.11, 770.12 and 390.76

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Solution

The fourth proportional to 559.11, 770.12 and 390.76 is: 538.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.11 : 770.12 = 390.76 : x
  2. Step 2: Convert to fraction form
    559.11/770.12 = 390.76/x
  3. Step 3: Cross multiply
    559.11x = 770.12 × 390.76
  4. Step 4: Simplify right side
    559.11x = 300,932.09
  5. Step 5: Solve for x
    x = 300,932.09/559.11
  6. Step 6: Final answer
    x = 538.24

Related Problems

Find fourth proportional to 279.55, 385.06 and 195.38
Half scale
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Double scale
Find fourth proportional to 560.11, 771.50 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.