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Finding the Fourth Proportional to 520,070.40, 780,105.60 and 319,741.20

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Solution

The fourth proportional to 520,070.40, 780,105.60 and 319,741.20 is: 479,611.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,070.40 : 780,105.60 = 319,741.20 : x
  2. Step 2: Convert to fraction form
    520,070.40/780,105.60 = 319,741.20/x
  3. Step 3: Cross multiply
    520,070.40x = 780,105.60 × 319,741.20
  4. Step 4: Simplify right side
    520,070.40x = 249,431,900,670.72
  5. Step 5: Solve for x
    x = 249,431,900,670.72/520,070.40
  6. Step 6: Final answer
    x = 479,611.80

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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.