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Finding the Fourth Proportional to 989.72, 1,484.02 and 526.32

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Solution

The fourth proportional to 989.72, 1,484.02 and 526.32 is: 789.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.72 : 1,484.02 = 526.32 : x
  2. Step 2: Convert to fraction form
    989.72/1,484.02 = 526.32/x
  3. Step 3: Cross multiply
    989.72x = 1,484.02 × 526.32
  4. Step 4: Simplify right side
    989.72x = 781,069.41
  5. Step 5: Solve for x
    x = 781,069.41/989.72
  6. Step 6: Final answer
    x = 789.18

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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.