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Finding the Fourth Proportional to 988.70, 1,483.04 and 411.57

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Solution

The fourth proportional to 988.70, 1,483.04 and 411.57 is: 617.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.70 : 1,483.04 = 411.57 : x
  2. Step 2: Convert to fraction form
    988.70/1,483.04 = 411.57/x
  3. Step 3: Cross multiply
    988.70x = 1,483.04 × 411.57
  4. Step 4: Simplify right side
    988.70x = 610,372.71
  5. Step 5: Solve for x
    x = 610,372.71/988.70
  6. Step 6: Final answer
    x = 617.35

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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.