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Finding the Fourth Proportional to 765.08, 1,055.80 and 415.76

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Solution

The fourth proportional to 765.08, 1,055.80 and 415.76 is: 573.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.08 : 1,055.80 = 415.76 : x
  2. Step 2: Convert to fraction form
    765.08/1,055.80 = 415.76/x
  3. Step 3: Cross multiply
    765.08x = 1,055.80 × 415.76
  4. Step 4: Simplify right side
    765.08x = 438,959.41
  5. Step 5: Solve for x
    x = 438,959.41/765.08
  6. Step 6: Final answer
    x = 573.74

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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.