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Finding the Fourth Proportional to 760.86, 1,135.35 and 679.05

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Solution

The fourth proportional to 760.86, 1,135.35 and 679.05 is: 1,013.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.86 : 1,135.35 = 679.05 : x
  2. Step 2: Convert to fraction form
    760.86/1,135.35 = 679.05/x
  3. Step 3: Cross multiply
    760.86x = 1,135.35 × 679.05
  4. Step 4: Simplify right side
    760.86x = 770,959.42
  5. Step 5: Solve for x
    x = 770,959.42/760.86
  6. Step 6: Final answer
    x = 1,013.27

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.