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Finding the Fourth Proportional to 515.66, 777.02 and 426.35

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Solution

The fourth proportional to 515.66, 777.02 and 426.35 is: 642.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.66 : 777.02 = 426.35 : x
  2. Step 2: Convert to fraction form
    515.66/777.02 = 426.35/x
  3. Step 3: Cross multiply
    515.66x = 777.02 × 426.35
  4. Step 4: Simplify right side
    515.66x = 331,284.42
  5. Step 5: Solve for x
    x = 331,284.42/515.66
  6. Step 6: Final answer
    x = 642.45

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.