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Finding the Fourth Proportional to 1,519.84, 2,280 and 654.40

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Solution

The fourth proportional to 1,519.84, 2,280 and 654.40 is: 981.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,519.84 : 2,280 = 654.40 : x
  2. Step 2: Convert to fraction form
    1,519.84/2,280 = 654.40/x
  3. Step 3: Cross multiply
    1,519.84x = 2,280 × 654.40
  4. Step 4: Simplify right side
    1,519.84x = 1,492,032
  5. Step 5: Solve for x
    x = 1,492,032/1,519.84
  6. Step 6: Final answer
    x = 981.70

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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.