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Finding the Fourth Proportional to 818.18, 1,129.10 and 445.17

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Solution

The fourth proportional to 818.18, 1,129.10 and 445.17 is: 614.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.18 : 1,129.10 = 445.17 : x
  2. Step 2: Convert to fraction form
    818.18/1,129.10 = 445.17/x
  3. Step 3: Cross multiply
    818.18x = 1,129.10 × 445.17
  4. Step 4: Simplify right side
    818.18x = 502,639.22
  5. Step 5: Solve for x
    x = 502,639.22/818.18
  6. Step 6: Final answer
    x = 614.34

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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.