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Finding the Fourth Proportional to 1,320.19, 1,978.91 and 590.28

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Solution

The fourth proportional to 1,320.19, 1,978.91 and 590.28 is: 884.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.19 : 1,978.91 = 590.28 : x
  2. Step 2: Convert to fraction form
    1,320.19/1,978.91 = 590.28/x
  3. Step 3: Cross multiply
    1,320.19x = 1,978.91 × 590.28
  4. Step 4: Simplify right side
    1,320.19x = 1,168,110.99
  5. Step 5: Solve for x
    x = 1,168,110.99/1,320.19
  6. Step 6: Final answer
    x = 884.81

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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.