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Finding the Fourth Proportional to 865.08, 1,297.62 and 578.34

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Solution

The fourth proportional to 865.08, 1,297.62 and 578.34 is: 867.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.08 : 1,297.62 = 578.34 : x
  2. Step 2: Convert to fraction form
    865.08/1,297.62 = 578.34/x
  3. Step 3: Cross multiply
    865.08x = 1,297.62 × 578.34
  4. Step 4: Simplify right side
    865.08x = 750,465.55
  5. Step 5: Solve for x
    x = 750,465.55/865.08
  6. Step 6: Final answer
    x = 867.51

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Half scale
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Double scale
Find fourth proportional to 866.08, 1,299.12 and 579.34
Similar ratio
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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.