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Finding the Fourth Proportional to 989.58, 1,483 and 623.72

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Solution

The fourth proportional to 989.58, 1,483 and 623.72 is: 934.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.58 : 1,483 = 623.72 : x
  2. Step 2: Convert to fraction form
    989.58/1,483 = 623.72/x
  3. Step 3: Cross multiply
    989.58x = 1,483 × 623.72
  4. Step 4: Simplify right side
    989.58x = 924,976.76
  5. Step 5: Solve for x
    x = 924,976.76/989.58
  6. Step 6: Final answer
    x = 934.72

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Double scale
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1.5x scale

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.