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Finding the Fourth Proportional to 578.77, 798.68 and 316.78

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Solution

The fourth proportional to 578.77, 798.68 and 316.78 is: 437.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.77 : 798.68 = 316.78 : x
  2. Step 2: Convert to fraction form
    578.77/798.68 = 316.78/x
  3. Step 3: Cross multiply
    578.77x = 798.68 × 316.78
  4. Step 4: Simplify right side
    578.77x = 253,004.65
  5. Step 5: Solve for x
    x = 253,004.65/578.77
  6. Step 6: Final answer
    x = 437.14

Related Problems

Find fourth proportional to 289.38, 399.34 and 158.39
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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.