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Finding the Fourth Proportional to 988.75, 1,364.60 and 574.75

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Solution

The fourth proportional to 988.75, 1,364.60 and 574.75 is: 793.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.75 : 1,364.60 = 574.75 : x
  2. Step 2: Convert to fraction form
    988.75/1,364.60 = 574.75/x
  3. Step 3: Cross multiply
    988.75x = 1,364.60 × 574.75
  4. Step 4: Simplify right side
    988.75x = 784,300.98
  5. Step 5: Solve for x
    x = 784,300.98/988.75
  6. Step 6: Final answer
    x = 793.22

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.