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Finding the Fourth Proportional to 620,720.80, 931,081.20 and 442,261.60

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Solution

The fourth proportional to 620,720.80, 931,081.20 and 442,261.60 is: 663,392.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,720.80 : 931,081.20 = 442,261.60 : x
  2. Step 2: Convert to fraction form
    620,720.80/931,081.20 = 442,261.60/x
  3. Step 3: Cross multiply
    620,720.80x = 931,081.20 × 442,261.60
  4. Step 4: Simplify right side
    620,720.80x = 411,781,461,241.92
  5. Step 5: Solve for x
    x = 411,781,461,241.92/620,720.80
  6. Step 6: Final answer
    x = 663,392.40

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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.