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Finding the Fourth Proportional to 520,000.20, 780,000.30 and 436,019.40

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Solution

The fourth proportional to 520,000.20, 780,000.30 and 436,019.40 is: 654,029.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,000.20 : 780,000.30 = 436,019.40 : x
  2. Step 2: Convert to fraction form
    520,000.20/780,000.30 = 436,019.40/x
  3. Step 3: Cross multiply
    520,000.20x = 780,000.30 × 436,019.40
  4. Step 4: Simplify right side
    520,000.20x = 340,095,262,805.82
  5. Step 5: Solve for x
    x = 340,095,262,805.82/520,000.20
  6. Step 6: Final answer
    x = 654,029.10

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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.