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Finding the Fourth Proportional to 646.12, 968.77 and 429.45

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Solution

The fourth proportional to 646.12, 968.77 and 429.45 is: 643.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.12 : 968.77 = 429.45 : x
  2. Step 2: Convert to fraction form
    646.12/968.77 = 429.45/x
  3. Step 3: Cross multiply
    646.12x = 968.77 × 429.45
  4. Step 4: Simplify right side
    646.12x = 416,038.28
  5. Step 5: Solve for x
    x = 416,038.28/646.12
  6. Step 6: Final answer
    x = 643.90

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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.