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Finding the Fourth Proportional to 646.29, 890.87 and 425.16

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Solution

The fourth proportional to 646.29, 890.87 and 425.16 is: 586.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.29 : 890.87 = 425.16 : x
  2. Step 2: Convert to fraction form
    646.29/890.87 = 425.16/x
  3. Step 3: Cross multiply
    646.29x = 890.87 × 425.16
  4. Step 4: Simplify right side
    646.29x = 378,760.16
  5. Step 5: Solve for x
    x = 378,760.16/646.29
  6. Step 6: Final answer
    x = 586.05

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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.