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Finding the Fourth Proportional to 765.40, 1,056 and 433.72

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Solution

The fourth proportional to 765.40, 1,056 and 433.72 is: 598.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.40 : 1,056 = 433.72 : x
  2. Step 2: Convert to fraction form
    765.40/1,056 = 433.72/x
  3. Step 3: Cross multiply
    765.40x = 1,056 × 433.72
  4. Step 4: Simplify right side
    765.40x = 458,008.32
  5. Step 5: Solve for x
    x = 458,008.32/765.40
  6. Step 6: Final answer
    x = 598.39

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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.