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Finding the Fourth Proportional to 1,439.84, 1,985.64 and 997.04

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Solution

The fourth proportional to 1,439.84, 1,985.64 and 997.04 is: 1,374.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.84 : 1,985.64 = 997.04 : x
  2. Step 2: Convert to fraction form
    1,439.84/1,985.64 = 997.04/x
  3. Step 3: Cross multiply
    1,439.84x = 1,985.64 × 997.04
  4. Step 4: Simplify right side
    1,439.84x = 1,979,762.51
  5. Step 5: Solve for x
    x = 1,979,762.51/1,439.84
  6. Step 6: Final answer
    x = 1,374.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.