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Finding the Fourth Proportional to 613.70, 921 and 340.02

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Solution

The fourth proportional to 613.70, 921 and 340.02 is: 510.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.70 : 921 = 340.02 : x
  2. Step 2: Convert to fraction form
    613.70/921 = 340.02/x
  3. Step 3: Cross multiply
    613.70x = 921 × 340.02
  4. Step 4: Simplify right side
    613.70x = 313,158.42
  5. Step 5: Solve for x
    x = 313,158.42/613.70
  6. Step 6: Final answer
    x = 510.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.