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Finding the Fourth Proportional to 971.91, 1,455.84 and 646.29

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Solution

The fourth proportional to 971.91, 1,455.84 and 646.29 is: 968.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.91 : 1,455.84 = 646.29 : x
  2. Step 2: Convert to fraction form
    971.91/1,455.84 = 646.29/x
  3. Step 3: Cross multiply
    971.91x = 1,455.84 × 646.29
  4. Step 4: Simplify right side
    971.91x = 940,894.83
  5. Step 5: Solve for x
    x = 940,894.83/971.91
  6. Step 6: Final answer
    x = 968.09

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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.