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Finding the Fourth Proportional to 890,306.40, 1,335,459.60 and 259,240.80

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Solution

The fourth proportional to 890,306.40, 1,335,459.60 and 259,240.80 is: 388,861.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    890,306.40 : 1,335,459.60 = 259,240.80 : x
  2. Step 2: Convert to fraction form
    890,306.40/1,335,459.60 = 259,240.80/x
  3. Step 3: Cross multiply
    890,306.40x = 1,335,459.60 × 259,240.80
  4. Step 4: Simplify right side
    890,306.40x = 346,205,615,071.68
  5. Step 5: Solve for x
    x = 346,205,615,071.68/890,306.40
  6. Step 6: Final answer
    x = 388,861.20

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Double scale
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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.