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Finding the Fourth Proportional to 878.20, 1,316.58 and 439.24

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Solution

The fourth proportional to 878.20, 1,316.58 and 439.24 is: 658.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.20 : 1,316.58 = 439.24 : x
  2. Step 2: Convert to fraction form
    878.20/1,316.58 = 439.24/x
  3. Step 3: Cross multiply
    878.20x = 1,316.58 × 439.24
  4. Step 4: Simplify right side
    878.20x = 578,294.60
  5. Step 5: Solve for x
    x = 578,294.60/878.20
  6. Step 6: Final answer
    x = 658.50

Related Problems

Find fourth proportional to 439.10, 658.29 and 219.62
Half scale
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Double scale
Find fourth proportional to 879.20, 1,318.08 and 440.24
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.