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Finding the Fourth Proportional to 1,022.75, 1,411.40 and 557

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Solution

The fourth proportional to 1,022.75, 1,411.40 and 557 is: 768.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,022.75 : 1,411.40 = 557 : x
  2. Step 2: Convert to fraction form
    1,022.75/1,411.40 = 557/x
  3. Step 3: Cross multiply
    1,022.75x = 1,411.40 × 557
  4. Step 4: Simplify right side
    1,022.75x = 786,149.80
  5. Step 5: Solve for x
    x = 786,149.80/1,022.75
  6. Step 6: Final answer
    x = 768.66

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Half scale
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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.