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Finding the Fourth Proportional to 520,011.40, 780,017.10 and 331,054.60

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Solution

The fourth proportional to 520,011.40, 780,017.10 and 331,054.60 is: 496,581.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,011.40 : 780,017.10 = 331,054.60 : x
  2. Step 2: Convert to fraction form
    520,011.40/780,017.10 = 331,054.60/x
  3. Step 3: Cross multiply
    520,011.40x = 780,017.10 × 331,054.60
  4. Step 4: Simplify right side
    520,011.40x = 258,228,249,033.66
  5. Step 5: Solve for x
    x = 258,228,249,033.66/520,011.40
  6. Step 6: Final answer
    x = 496,581.90

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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.