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Finding the Fourth Proportional to 1,145.80, 1,718.40 and 780.52

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Solution

The fourth proportional to 1,145.80, 1,718.40 and 780.52 is: 1,170.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.80 : 1,718.40 = 780.52 : x
  2. Step 2: Convert to fraction form
    1,145.80/1,718.40 = 780.52/x
  3. Step 3: Cross multiply
    1,145.80x = 1,718.40 × 780.52
  4. Step 4: Simplify right side
    1,145.80x = 1,341,245.57
  5. Step 5: Solve for x
    x = 1,341,245.57/1,145.80
  6. Step 6: Final answer
    x = 1,170.58

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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.