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Finding the Fourth Proportional to 889.69, 1,335.36 and 479.20

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Solution

The fourth proportional to 889.69, 1,335.36 and 479.20 is: 719.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.69 : 1,335.36 = 479.20 : x
  2. Step 2: Convert to fraction form
    889.69/1,335.36 = 479.20/x
  3. Step 3: Cross multiply
    889.69x = 1,335.36 × 479.20
  4. Step 4: Simplify right side
    889.69x = 639,904.51
  5. Step 5: Solve for x
    x = 639,904.51/889.69
  6. Step 6: Final answer
    x = 719.24

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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.