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Finding the Fourth Proportional to 572.76, 790.40 and 310.77

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Solution

The fourth proportional to 572.76, 790.40 and 310.77 is: 428.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.76 : 790.40 = 310.77 : x
  2. Step 2: Convert to fraction form
    572.76/790.40 = 310.77/x
  3. Step 3: Cross multiply
    572.76x = 790.40 × 310.77
  4. Step 4: Simplify right side
    572.76x = 245,631.05
  5. Step 5: Solve for x
    x = 245,631.05/572.76
  6. Step 6: Final answer
    x = 428.86

Related Problems

Find fourth proportional to 286.38, 395.20 and 155.39
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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.