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Finding the Fourth Proportional to 646.03, 964.31 and 555.31

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Solution

The fourth proportional to 646.03, 964.31 and 555.31 is: 828.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.03 : 964.31 = 555.31 : x
  2. Step 2: Convert to fraction form
    646.03/964.31 = 555.31/x
  3. Step 3: Cross multiply
    646.03x = 964.31 × 555.31
  4. Step 4: Simplify right side
    646.03x = 535,490.99
  5. Step 5: Solve for x
    x = 535,490.99/646.03
  6. Step 6: Final answer
    x = 828.89

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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.