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Finding the Fourth Proportional to 620,687.80, 931,031.70 and 442,228.60

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Solution

The fourth proportional to 620,687.80, 931,031.70 and 442,228.60 is: 663,342.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,687.80 : 931,031.70 = 442,228.60 : x
  2. Step 2: Convert to fraction form
    620,687.80/931,031.70 = 442,228.60/x
  3. Step 3: Cross multiply
    620,687.80x = 931,031.70 × 442,228.60
  4. Step 4: Simplify right side
    620,687.80x = 411,728,845,246.62
  5. Step 5: Solve for x
    x = 411,728,845,246.62/620,687.80
  6. Step 6: Final answer
    x = 663,342.90

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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.