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Finding the Fourth Proportional to 839.66, 1,158.71 and 485.55

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Solution

The fourth proportional to 839.66, 1,158.71 and 485.55 is: 670.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.66 : 1,158.71 = 485.55 : x
  2. Step 2: Convert to fraction form
    839.66/1,158.71 = 485.55/x
  3. Step 3: Cross multiply
    839.66x = 1,158.71 × 485.55
  4. Step 4: Simplify right side
    839.66x = 562,609.21
  5. Step 5: Solve for x
    x = 562,609.21/839.66
  6. Step 6: Final answer
    x = 670.05

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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.