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Finding the Fourth Proportional to 2,340.95, 3,510.51 and 780.65

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Solution

The fourth proportional to 2,340.95, 3,510.51 and 780.65 is: 1,170.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,340.95 : 3,510.51 = 780.65 : x
  2. Step 2: Convert to fraction form
    2,340.95/3,510.51 = 780.65/x
  3. Step 3: Cross multiply
    2,340.95x = 3,510.51 × 780.65
  4. Step 4: Simplify right side
    2,340.95x = 2,740,462.08
  5. Step 5: Solve for x
    x = 2,740,462.08/2,340.95
  6. Step 6: Final answer
    x = 1,170.66

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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.