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Finding the Fourth Proportional to 620,432.70, 930,649.05 and 407,856.30

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Solution

The fourth proportional to 620,432.70, 930,649.05 and 407,856.30 is: 611,784.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,432.70 : 930,649.05 = 407,856.30 : x
  2. Step 2: Convert to fraction form
    620,432.70/930,649.05 = 407,856.30/x
  3. Step 3: Cross multiply
    620,432.70x = 930,649.05 × 407,856.30
  4. Step 4: Simplify right side
    620,432.70x = 379,571,078,131.52
  5. Step 5: Solve for x
    x = 379,571,078,131.52/620,432.70
  6. Step 6: Final answer
    x = 611,784.45

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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.