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Finding the Fourth Proportional to 1,915.65, 2,870.99 and 803.81

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Solution

The fourth proportional to 1,915.65, 2,870.99 and 803.81 is: 1,204.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,915.65 : 2,870.99 = 803.81 : x
  2. Step 2: Convert to fraction form
    1,915.65/2,870.99 = 803.81/x
  3. Step 3: Cross multiply
    1,915.65x = 2,870.99 × 803.81
  4. Step 4: Simplify right side
    1,915.65x = 2,307,725.02
  5. Step 5: Solve for x
    x = 2,307,725.02/1,915.65
  6. Step 6: Final answer
    x = 1,204.67

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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.