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Finding the Fourth Proportional to 765.62, 1,056.71 and 434.07

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Solution

The fourth proportional to 765.62, 1,056.71 and 434.07 is: 599.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.62 : 1,056.71 = 434.07 : x
  2. Step 2: Convert to fraction form
    765.62/1,056.71 = 434.07/x
  3. Step 3: Cross multiply
    765.62x = 1,056.71 × 434.07
  4. Step 4: Simplify right side
    765.62x = 458,683.94
  5. Step 5: Solve for x
    x = 458,683.94/765.62
  6. Step 6: Final answer
    x = 599.11

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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.