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Finding the Fourth Proportional to 572.74, 790.39 and 310.76

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Solution

The fourth proportional to 572.74, 790.39 and 310.76 is: 428.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.74 : 790.39 = 310.76 : x
  2. Step 2: Convert to fraction form
    572.74/790.39 = 310.76/x
  3. Step 3: Cross multiply
    572.74x = 790.39 × 310.76
  4. Step 4: Simplify right side
    572.74x = 245,619.02
  5. Step 5: Solve for x
    x = 245,619.02/572.74
  6. Step 6: Final answer
    x = 428.85

Related Problems

Find fourth proportional to 286.37, 395.20 and 155.38
Half scale
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Double scale
Find fourth proportional to 573.74, 791.77 and 311.76
Similar ratio
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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.