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Finding the Fourth Proportional to 578.93, 868.39 and 290.30

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Solution

The fourth proportional to 578.93, 868.39 and 290.30 is: 435.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.93 : 868.39 = 290.30 : x
  2. Step 2: Convert to fraction form
    578.93/868.39 = 290.30/x
  3. Step 3: Cross multiply
    578.93x = 868.39 × 290.30
  4. Step 4: Simplify right side
    578.93x = 252,088.55
  5. Step 5: Solve for x
    x = 252,088.55/578.93
  6. Step 6: Final answer
    x = 435.44

Related Problems

Find fourth proportional to 289.46, 434.19 and 145.15
Half scale
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Double scale
Find fourth proportional to 579.93, 869.89 and 291.30
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.