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Finding the Fourth Proportional to 1,320.04, 1,978.61 and 703.13

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Solution

The fourth proportional to 1,320.04, 1,978.61 and 703.13 is: 1,053.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.04 : 1,978.61 = 703.13 : x
  2. Step 2: Convert to fraction form
    1,320.04/1,978.61 = 703.13/x
  3. Step 3: Cross multiply
    1,320.04x = 1,978.61 × 703.13
  4. Step 4: Simplify right side
    1,320.04x = 1,391,206.64
  5. Step 5: Solve for x
    x = 1,391,206.64/1,320.04
  6. Step 6: Final answer
    x = 1,053.91

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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.