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Finding the Fourth Proportional to 989.52, 1,484.76 and 623.28

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Solution

The fourth proportional to 989.52, 1,484.76 and 623.28 is: 935.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.52 : 1,484.76 = 623.28 : x
  2. Step 2: Convert to fraction form
    989.52/1,484.76 = 623.28/x
  3. Step 3: Cross multiply
    989.52x = 1,484.76 × 623.28
  4. Step 4: Simplify right side
    989.52x = 925,421.21
  5. Step 5: Solve for x
    x = 925,421.21/989.52
  6. Step 6: Final answer
    x = 935.22

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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.