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Finding the Fourth Proportional to 1,915.64, 2,870.80 and 873.09

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Solution

The fourth proportional to 1,915.64, 2,870.80 and 873.09 is: 1,308.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,915.64 : 2,870.80 = 873.09 : x
  2. Step 2: Convert to fraction form
    1,915.64/2,870.80 = 873.09/x
  3. Step 3: Cross multiply
    1,915.64x = 2,870.80 × 873.09
  4. Step 4: Simplify right side
    1,915.64x = 2,506,475.12
  5. Step 5: Solve for x
    x = 2,506,475.12/1,915.64
  6. Step 6: Final answer
    x = 1,308.43

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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.