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Finding the Fourth Proportional to 520,053.80, 780,080.70 and 319,724.60

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Solution

The fourth proportional to 520,053.80, 780,080.70 and 319,724.60 is: 479,586.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,053.80 : 780,080.70 = 319,724.60 : x
  2. Step 2: Convert to fraction form
    520,053.80/780,080.70 = 319,724.60/x
  3. Step 3: Cross multiply
    520,053.80x = 780,080.70 × 319,724.60
  4. Step 4: Simplify right side
    520,053.80x = 249,410,989,775.22
  5. Step 5: Solve for x
    x = 249,410,989,775.22/520,053.80
  6. Step 6: Final answer
    x = 479,586.90

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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.