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Finding the Fourth Proportional to 479.99, 718.40 and 260.28

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Solution

The fourth proportional to 479.99, 718.40 and 260.28 is: 389.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.99 : 718.40 = 260.28 : x
  2. Step 2: Convert to fraction form
    479.99/718.40 = 260.28/x
  3. Step 3: Cross multiply
    479.99x = 718.40 × 260.28
  4. Step 4: Simplify right side
    479.99x = 186,985.80
  5. Step 5: Solve for x
    x = 186,985.80/479.99
  6. Step 6: Final answer
    x = 389.56

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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.