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Finding the Fourth Proportional to 989.42, 1,483.98 and 578.76

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Solution

The fourth proportional to 989.42, 1,483.98 and 578.76 is: 868.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.42 : 1,483.98 = 578.76 : x
  2. Step 2: Convert to fraction form
    989.42/1,483.98 = 578.76/x
  3. Step 3: Cross multiply
    989.42x = 1,483.98 × 578.76
  4. Step 4: Simplify right side
    989.42x = 858,868.26
  5. Step 5: Solve for x
    x = 858,868.26/989.42
  6. Step 6: Final answer
    x = 868.05

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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.