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Finding the Fourth Proportional to 620,418.60, 930,627.90 and 407,842.20

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Solution

The fourth proportional to 620,418.60, 930,627.90 and 407,842.20 is: 611,763.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,418.60 : 930,627.90 = 407,842.20 : x
  2. Step 2: Convert to fraction form
    620,418.60/930,627.90 = 407,842.20/x
  3. Step 3: Cross multiply
    620,418.60x = 930,627.90 × 407,842.20
  4. Step 4: Simplify right side
    620,418.60x = 379,549,330,117.38
  5. Step 5: Solve for x
    x = 379,549,330,117.38/620,418.60
  6. Step 6: Final answer
    x = 611,763.30

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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.