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Finding the Fourth Proportional to 520,036.60, 780,054.90 and 431,390.20

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Solution

The fourth proportional to 520,036.60, 780,054.90 and 431,390.20 is: 647,085.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,036.60 : 780,054.90 = 431,390.20 : x
  2. Step 2: Convert to fraction form
    520,036.60/780,054.90 = 431,390.20/x
  3. Step 3: Cross multiply
    520,036.60x = 780,054.90 × 431,390.20
  4. Step 4: Simplify right side
    520,036.60x = 336,508,039,321.98
  5. Step 5: Solve for x
    x = 336,508,039,321.98/520,036.60
  6. Step 6: Final answer
    x = 647,085.30

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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.