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Finding the Fourth Proportional to 620,690.80, 931,036.20 and 442,231.60

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Solution

The fourth proportional to 620,690.80, 931,036.20 and 442,231.60 is: 663,347.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,690.80 : 931,036.20 = 442,231.60 : x
  2. Step 2: Convert to fraction form
    620,690.80/931,036.20 = 442,231.60/x
  3. Step 3: Cross multiply
    620,690.80x = 931,036.20 × 442,231.60
  4. Step 4: Simplify right side
    620,690.80x = 411,733,628,383.92
  5. Step 5: Solve for x
    x = 411,733,628,383.92/620,690.80
  6. Step 6: Final answer
    x = 663,347.40

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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.