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Finding the Fourth Proportional to 1,320.06, 1,979.91 and 772.50

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Solution

The fourth proportional to 1,320.06, 1,979.91 and 772.50 is: 1,158.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.06 : 1,979.91 = 772.50 : x
  2. Step 2: Convert to fraction form
    1,320.06/1,979.91 = 772.50/x
  3. Step 3: Cross multiply
    1,320.06x = 1,979.91 × 772.50
  4. Step 4: Simplify right side
    1,320.06x = 1,529,480.48
  5. Step 5: Solve for x
    x = 1,529,480.48/1,320.06
  6. Step 6: Final answer
    x = 1,158.64

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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.