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Finding the Fourth Proportional to 520.76, 718.62 and 311.02

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Solution

The fourth proportional to 520.76, 718.62 and 311.02 is: 429.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.76 : 718.62 = 311.02 : x
  2. Step 2: Convert to fraction form
    520.76/718.62 = 311.02/x
  3. Step 3: Cross multiply
    520.76x = 718.62 × 311.02
  4. Step 4: Simplify right side
    520.76x = 223,505.19
  5. Step 5: Solve for x
    x = 223,505.19/520.76
  6. Step 6: Final answer
    x = 429.19

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Find fourth proportional to 260.38, 359.31 and 155.51
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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.