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Finding the Fourth Proportional to 1,680.63, 2,520.95 and 915.99

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Solution

The fourth proportional to 1,680.63, 2,520.95 and 915.99 is: 1,373.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.63 : 2,520.95 = 915.99 : x
  2. Step 2: Convert to fraction form
    1,680.63/2,520.95 = 915.99/x
  3. Step 3: Cross multiply
    1,680.63x = 2,520.95 × 915.99
  4. Step 4: Simplify right side
    1,680.63x = 2,309,160.41
  5. Step 5: Solve for x
    x = 2,309,160.41/1,680.63
  6. Step 6: Final answer
    x = 1,373.99

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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.