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Finding the Fourth Proportional to 765.21, 1,055.90 and 433.63

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Solution

The fourth proportional to 765.21, 1,055.90 and 433.63 is: 598.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.21 : 1,055.90 = 433.63 : x
  2. Step 2: Convert to fraction form
    765.21/1,055.90 = 433.63/x
  3. Step 3: Cross multiply
    765.21x = 1,055.90 × 433.63
  4. Step 4: Simplify right side
    765.21x = 457,864.64
  5. Step 5: Solve for x
    x = 457,864.64/765.21
  6. Step 6: Final answer
    x = 598.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.