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Finding the Fourth Proportional to 457.02, 630.66 and 309.70

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Solution

The fourth proportional to 457.02, 630.66 and 309.70 is: 427.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.02 : 630.66 = 309.70 : x
  2. Step 2: Convert to fraction form
    457.02/630.66 = 309.70/x
  3. Step 3: Cross multiply
    457.02x = 630.66 × 309.70
  4. Step 4: Simplify right side
    457.02x = 195,315.40
  5. Step 5: Solve for x
    x = 195,315.40/457.02
  6. Step 6: Final answer
    x = 427.37

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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.