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Finding the Fourth Proportional to 434.64, 647.71 and 433.92

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Solution

The fourth proportional to 434.64, 647.71 and 433.92 is: 646.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    434.64 : 647.71 = 433.92 : x
  2. Step 2: Convert to fraction form
    434.64/647.71 = 433.92/x
  3. Step 3: Cross multiply
    434.64x = 647.71 × 433.92
  4. Step 4: Simplify right side
    434.64x = 281,054.32
  5. Step 5: Solve for x
    x = 281,054.32/434.64
  6. Step 6: Final answer
    x = 646.64

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.