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Finding the Fourth Proportional to 989.76, 1,482.51 and 578.49

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Solution

The fourth proportional to 989.76, 1,482.51 and 578.49 is: 866.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.76 : 1,482.51 = 578.49 : x
  2. Step 2: Convert to fraction form
    989.76/1,482.51 = 578.49/x
  3. Step 3: Cross multiply
    989.76x = 1,482.51 × 578.49
  4. Step 4: Simplify right side
    989.76x = 857,617.21
  5. Step 5: Solve for x
    x = 857,617.21/989.76
  6. Step 6: Final answer
    x = 866.49

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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.