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Finding the Fourth Proportional to 1,000.77, 1,381.13 and 558.75

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Solution

The fourth proportional to 1,000.77, 1,381.13 and 558.75 is: 771.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.77 : 1,381.13 = 558.75 : x
  2. Step 2: Convert to fraction form
    1,000.77/1,381.13 = 558.75/x
  3. Step 3: Cross multiply
    1,000.77x = 1,381.13 × 558.75
  4. Step 4: Simplify right side
    1,000.77x = 771,706.39
  5. Step 5: Solve for x
    x = 771,706.39/1,000.77
  6. Step 6: Final answer
    x = 771.11

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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.