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Finding the Fourth Proportional to 1,328.88, 1,979.28 and 1,259.49

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Solution

The fourth proportional to 1,328.88, 1,979.28 and 1,259.49 is: 1,875.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.88 : 1,979.28 = 1,259.49 : x
  2. Step 2: Convert to fraction form
    1,328.88/1,979.28 = 1,259.49/x
  3. Step 3: Cross multiply
    1,328.88x = 1,979.28 × 1,259.49
  4. Step 4: Simplify right side
    1,328.88x = 2,492,883.37
  5. Step 5: Solve for x
    x = 2,492,883.37/1,328.88
  6. Step 6: Final answer
    x = 1,875.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.