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Finding the Fourth Proportional to 983.60, 1,476.03 and 521.18

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Solution

The fourth proportional to 983.60, 1,476.03 and 521.18 is: 782.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.60 : 1,476.03 = 521.18 : x
  2. Step 2: Convert to fraction form
    983.60/1,476.03 = 521.18/x
  3. Step 3: Cross multiply
    983.60x = 1,476.03 × 521.18
  4. Step 4: Simplify right side
    983.60x = 769,277.32
  5. Step 5: Solve for x
    x = 769,277.32/983.60
  6. Step 6: Final answer
    x = 782.10

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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.