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Finding the Fourth Proportional to 643,715.40, 965,573.10 and 360,280.20

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Solution

The fourth proportional to 643,715.40, 965,573.10 and 360,280.20 is: 540,420.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,715.40 : 965,573.10 = 360,280.20 : x
  2. Step 2: Convert to fraction form
    643,715.40/965,573.10 = 360,280.20/x
  3. Step 3: Cross multiply
    643,715.40x = 965,573.10 × 360,280.20
  4. Step 4: Simplify right side
    643,715.40x = 347,876,869,582.62
  5. Step 5: Solve for x
    x = 347,876,869,582.62/643,715.40
  6. Step 6: Final answer
    x = 540,420.30

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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.