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Finding the Fourth Proportional to 508.20, 762.30 and 457.80

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Solution

The fourth proportional to 508.20, 762.30 and 457.80 is: 686.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    508.20 : 762.30 = 457.80 : x
  2. Step 2: Convert to fraction form
    508.20/762.30 = 457.80/x
  3. Step 3: Cross multiply
    508.20x = 762.30 × 457.80
  4. Step 4: Simplify right side
    508.20x = 348,980.94
  5. Step 5: Solve for x
    x = 348,980.94/508.20
  6. Step 6: Final answer
    x = 686.70

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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.