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Finding the Fourth Proportional to 555.30, 832.15 and 407.89

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Solution

The fourth proportional to 555.30, 832.15 and 407.89 is: 611.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.30 : 832.15 = 407.89 : x
  2. Step 2: Convert to fraction form
    555.30/832.15 = 407.89/x
  3. Step 3: Cross multiply
    555.30x = 832.15 × 407.89
  4. Step 4: Simplify right side
    555.30x = 339,424.89
  5. Step 5: Solve for x
    x = 339,424.89/555.30
  6. Step 6: Final answer
    x = 611.25

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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.