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Finding the Fourth Proportional to 1,988.55, 2,977.34 and 1,009.89

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Solution

The fourth proportional to 1,988.55, 2,977.34 and 1,009.89 is: 1,512.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.55 : 2,977.34 = 1,009.89 : x
  2. Step 2: Convert to fraction form
    1,988.55/2,977.34 = 1,009.89/x
  3. Step 3: Cross multiply
    1,988.55x = 2,977.34 × 1,009.89
  4. Step 4: Simplify right side
    1,988.55x = 3,006,780.84
  5. Step 5: Solve for x
    x = 3,006,780.84/1,988.55
  6. Step 6: Final answer
    x = 1,512.05

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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.