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Finding the Fourth Proportional to 558.76, 771.12 and 310.12

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Solution

The fourth proportional to 558.76, 771.12 and 310.12 is: 427.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.76 : 771.12 = 310.12 : x
  2. Step 2: Convert to fraction form
    558.76/771.12 = 310.12/x
  3. Step 3: Cross multiply
    558.76x = 771.12 × 310.12
  4. Step 4: Simplify right side
    558.76x = 239,139.73
  5. Step 5: Solve for x
    x = 239,139.73/558.76
  6. Step 6: Final answer
    x = 427.98

Related Problems

Find fourth proportional to 279.38, 385.56 and 155.06
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Double scale
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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.