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Finding the Fourth Proportional to 646.42, 890.94 and 471.46

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Solution

The fourth proportional to 646.42, 890.94 and 471.46 is: 649.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.42 : 890.94 = 471.46 : x
  2. Step 2: Convert to fraction form
    646.42/890.94 = 471.46/x
  3. Step 3: Cross multiply
    646.42x = 890.94 × 471.46
  4. Step 4: Simplify right side
    646.42x = 420,042.57
  5. Step 5: Solve for x
    x = 420,042.57/646.42
  6. Step 6: Final answer
    x = 649.80

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1.5x scale

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.