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Finding the Fourth Proportional to 765.61, 1,056.55 and 416.30

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Solution

The fourth proportional to 765.61, 1,056.55 and 416.30 is: 574.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.61 : 1,056.55 = 416.30 : x
  2. Step 2: Convert to fraction form
    765.61/1,056.55 = 416.30/x
  3. Step 3: Cross multiply
    765.61x = 1,056.55 × 416.30
  4. Step 4: Simplify right side
    765.61x = 439,835.44
  5. Step 5: Solve for x
    x = 439,835.44/765.61
  6. Step 6: Final answer
    x = 574.49

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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.