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Finding the Fourth Proportional to 889.70, 1,332.32 and 478.95

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Solution

The fourth proportional to 889.70, 1,332.32 and 478.95 is: 717.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.70 : 1,332.32 = 478.95 : x
  2. Step 2: Convert to fraction form
    889.70/1,332.32 = 478.95/x
  3. Step 3: Cross multiply
    889.70x = 1,332.32 × 478.95
  4. Step 4: Simplify right side
    889.70x = 638,112.27
  5. Step 5: Solve for x
    x = 638,112.27/889.70
  6. Step 6: Final answer
    x = 717.23

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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.