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Finding the Fourth Proportional to 520,612.40, 780,918.60 and 515,082.80

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Solution

The fourth proportional to 520,612.40, 780,918.60 and 515,082.80 is: 772,624.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,612.40 : 780,918.60 = 515,082.80 : x
  2. Step 2: Convert to fraction form
    520,612.40/780,918.60 = 515,082.80/x
  3. Step 3: Cross multiply
    520,612.40x = 780,918.60 × 515,082.80
  4. Step 4: Simplify right side
    520,612.40x = 402,237,739,060.08
  5. Step 5: Solve for x
    x = 402,237,739,060.08/520,612.40
  6. Step 6: Final answer
    x = 772,624.20

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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.