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Finding the Fourth Proportional to 874.38, 1,206.60 and 481.40

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Solution

The fourth proportional to 874.38, 1,206.60 and 481.40 is: 664.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.38 : 1,206.60 = 481.40 : x
  2. Step 2: Convert to fraction form
    874.38/1,206.60 = 481.40/x
  3. Step 3: Cross multiply
    874.38x = 1,206.60 × 481.40
  4. Step 4: Simplify right side
    874.38x = 580,851.21
  5. Step 5: Solve for x
    x = 580,851.21/874.38
  6. Step 6: Final answer
    x = 664.30

Related Problems

Find fourth proportional to 437.19, 603.30 and 240.70
Half scale
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Double scale
Find fourth proportional to 875.38, 1,207.98 and 482.40
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.