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Finding the Fourth Proportional to 1,125.30, 1,685.21 and 777.71

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Solution

The fourth proportional to 1,125.30, 1,685.21 and 777.71 is: 1,164.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.30 : 1,685.21 = 777.71 : x
  2. Step 2: Convert to fraction form
    1,125.30/1,685.21 = 777.71/x
  3. Step 3: Cross multiply
    1,125.30x = 1,685.21 × 777.71
  4. Step 4: Simplify right side
    1,125.30x = 1,310,596.24
  5. Step 5: Solve for x
    x = 1,310,596.24/1,125.30
  6. Step 6: Final answer
    x = 1,164.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.