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Finding the Fourth Proportional to 1,116.07, 1,674.18 and 385.55

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Solution

The fourth proportional to 1,116.07, 1,674.18 and 385.55 is: 578.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.07 : 1,674.18 = 385.55 : x
  2. Step 2: Convert to fraction form
    1,116.07/1,674.18 = 385.55/x
  3. Step 3: Cross multiply
    1,116.07x = 1,674.18 × 385.55
  4. Step 4: Simplify right side
    1,116.07x = 645,484.28
  5. Step 5: Solve for x
    x = 645,484.28/1,116.07
  6. Step 6: Final answer
    x = 578.35

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Double scale
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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.