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Finding the Fourth Proportional to 889.74, 1,335.30 and 581.51

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Solution

The fourth proportional to 889.74, 1,335.30 and 581.51 is: 872.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.74 : 1,335.30 = 581.51 : x
  2. Step 2: Convert to fraction form
    889.74/1,335.30 = 581.51/x
  3. Step 3: Cross multiply
    889.74x = 1,335.30 × 581.51
  4. Step 4: Simplify right side
    889.74x = 776,490.30
  5. Step 5: Solve for x
    x = 776,490.30/889.74
  6. Step 6: Final answer
    x = 872.72

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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.