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Finding the Fourth Proportional to 765.79, 1,056.61 and 434.18

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Solution

The fourth proportional to 765.79, 1,056.61 and 434.18 is: 599.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.79 : 1,056.61 = 434.18 : x
  2. Step 2: Convert to fraction form
    765.79/1,056.61 = 434.18/x
  3. Step 3: Cross multiply
    765.79x = 1,056.61 × 434.18
  4. Step 4: Simplify right side
    765.79x = 458,756.17
  5. Step 5: Solve for x
    x = 458,756.17/765.79
  6. Step 6: Final answer
    x = 599.06

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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.