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Finding the Fourth Proportional to 1,259.76, 1,889.65 and 479.77

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Solution

The fourth proportional to 1,259.76, 1,889.65 and 479.77 is: 719.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.76 : 1,889.65 = 479.77 : x
  2. Step 2: Convert to fraction form
    1,259.76/1,889.65 = 479.77/x
  3. Step 3: Cross multiply
    1,259.76x = 1,889.65 × 479.77
  4. Step 4: Simplify right side
    1,259.76x = 906,597.38
  5. Step 5: Solve for x
    x = 906,597.38/1,259.76
  6. Step 6: Final answer
    x = 719.66

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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.