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Finding the Fourth Proportional to 1,985.87, 2,978.98 and 890.35

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Solution

The fourth proportional to 1,985.87, 2,978.98 and 890.35 is: 1,335.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.87 : 2,978.98 = 890.35 : x
  2. Step 2: Convert to fraction form
    1,985.87/2,978.98 = 890.35/x
  3. Step 3: Cross multiply
    1,985.87x = 2,978.98 × 890.35
  4. Step 4: Simplify right side
    1,985.87x = 2,652,325.17
  5. Step 5: Solve for x
    x = 2,652,325.17/1,985.87
  6. Step 6: Final answer
    x = 1,335.60

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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.