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Finding the Fourth Proportional to 985.50, 1,478.25 and 552.69

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Solution

The fourth proportional to 985.50, 1,478.25 and 552.69 is: 829.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.50 : 1,478.25 = 552.69 : x
  2. Step 2: Convert to fraction form
    985.50/1,478.25 = 552.69/x
  3. Step 3: Cross multiply
    985.50x = 1,478.25 × 552.69
  4. Step 4: Simplify right side
    985.50x = 817,013.99
  5. Step 5: Solve for x
    x = 817,013.99/985.50
  6. Step 6: Final answer
    x = 829.04

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Double scale
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Similar ratio
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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.