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Finding the Fourth Proportional to 989.48, 1,477.49 and 898.60

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Solution

The fourth proportional to 989.48, 1,477.49 and 898.60 is: 1,341.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.48 : 1,477.49 = 898.60 : x
  2. Step 2: Convert to fraction form
    989.48/1,477.49 = 898.60/x
  3. Step 3: Cross multiply
    989.48x = 1,477.49 × 898.60
  4. Step 4: Simplify right side
    989.48x = 1,327,672.51
  5. Step 5: Solve for x
    x = 1,327,672.51/989.48
  6. Step 6: Final answer
    x = 1,341.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.