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Finding the Fourth Proportional to 1,276.95, 1,915.44 and 546.51

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Solution

The fourth proportional to 1,276.95, 1,915.44 and 546.51 is: 819.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.95 : 1,915.44 = 546.51 : x
  2. Step 2: Convert to fraction form
    1,276.95/1,915.44 = 546.51/x
  3. Step 3: Cross multiply
    1,276.95x = 1,915.44 × 546.51
  4. Step 4: Simplify right side
    1,276.95x = 1,046,807.11
  5. Step 5: Solve for x
    x = 1,046,807.11/1,276.95
  6. Step 6: Final answer
    x = 819.77

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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.