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Finding the Fourth Proportional to 839.61, 1,158.57 and 480.69

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Solution

The fourth proportional to 839.61, 1,158.57 and 480.69 is: 663.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.61 : 1,158.57 = 480.69 : x
  2. Step 2: Convert to fraction form
    839.61/1,158.57 = 480.69/x
  3. Step 3: Cross multiply
    839.61x = 1,158.57 × 480.69
  4. Step 4: Simplify right side
    839.61x = 556,913.01
  5. Step 5: Solve for x
    x = 556,913.01/839.61
  6. Step 6: Final answer
    x = 663.30

Related Problems

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Half scale
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Double scale
Find fourth proportional to 840.61, 1,159.95 and 481.69
Similar ratio
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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.