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Finding the Fourth Proportional to 1,320.68, 1,980.01 and 703.87

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Solution

The fourth proportional to 1,320.68, 1,980.01 and 703.87 is: 1,055.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.68 : 1,980.01 = 703.87 : x
  2. Step 2: Convert to fraction form
    1,320.68/1,980.01 = 703.87/x
  3. Step 3: Cross multiply
    1,320.68x = 1,980.01 × 703.87
  4. Step 4: Simplify right side
    1,320.68x = 1,393,669.64
  5. Step 5: Solve for x
    x = 1,393,669.64/1,320.68
  6. Step 6: Final answer
    x = 1,055.27

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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.