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Finding the Fourth Proportional to 1,988.71, 2,980.61 and 817.98

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Solution

The fourth proportional to 1,988.71, 2,980.61 and 817.98 is: 1,225.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.71 : 2,980.61 = 817.98 : x
  2. Step 2: Convert to fraction form
    1,988.71/2,980.61 = 817.98/x
  3. Step 3: Cross multiply
    1,988.71x = 2,980.61 × 817.98
  4. Step 4: Simplify right side
    1,988.71x = 2,438,080.40
  5. Step 5: Solve for x
    x = 2,438,080.40/1,988.71
  6. Step 6: Final answer
    x = 1,225.96

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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.