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Finding the Fourth Proportional to 620,664.60, 930,996.90 and 408,088.20

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Solution

The fourth proportional to 620,664.60, 930,996.90 and 408,088.20 is: 612,132.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,664.60 : 930,996.90 = 408,088.20 : x
  2. Step 2: Convert to fraction form
    620,664.60/930,996.90 = 408,088.20/x
  3. Step 3: Cross multiply
    620,664.60x = 930,996.90 × 408,088.20
  4. Step 4: Simplify right side
    620,664.60x = 379,928,849,126.58
  5. Step 5: Solve for x
    x = 379,928,849,126.58/620,664.60
  6. Step 6: Final answer
    x = 612,132.30

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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.