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Finding the Fourth Proportional to 469.20, 646.20 and 426

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Solution

The fourth proportional to 469.20, 646.20 and 426 is: 586.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.20 : 646.20 = 426 : x
  2. Step 2: Convert to fraction form
    469.20/646.20 = 426/x
  3. Step 3: Cross multiply
    469.20x = 646.20 × 426
  4. Step 4: Simplify right side
    469.20x = 275,281.20
  5. Step 5: Solve for x
    x = 275,281.20/469.20
  6. Step 6: Final answer
    x = 586.70

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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.