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Finding the Fourth Proportional to 638,861.40, 958,292.10 and 358,342.20

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Solution

The fourth proportional to 638,861.40, 958,292.10 and 358,342.20 is: 537,513.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,861.40 : 958,292.10 = 358,342.20 : x
  2. Step 2: Convert to fraction form
    638,861.40/958,292.10 = 358,342.20/x
  3. Step 3: Cross multiply
    638,861.40x = 958,292.10 × 358,342.20
  4. Step 4: Simplify right side
    638,861.40x = 343,396,499,356.62
  5. Step 5: Solve for x
    x = 343,396,499,356.62/638,861.40
  6. Step 6: Final answer
    x = 537,513.30

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Double scale
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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.