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Finding the Fourth Proportional to 818.13, 1,129.90 and 555.69

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Solution

The fourth proportional to 818.13, 1,129.90 and 555.69 is: 767.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.13 : 1,129.90 = 555.69 : x
  2. Step 2: Convert to fraction form
    818.13/1,129.90 = 555.69/x
  3. Step 3: Cross multiply
    818.13x = 1,129.90 × 555.69
  4. Step 4: Simplify right side
    818.13x = 627,874.13
  5. Step 5: Solve for x
    x = 627,874.13/818.13
  6. Step 6: Final answer
    x = 767.45

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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.