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Finding the Fourth Proportional to 520,643.20, 779,236.80 and 378,083.20

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Solution

The fourth proportional to 520,643.20, 779,236.80 and 378,083.20 is: 565,869.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,643.20 : 779,236.80 = 378,083.20 : x
  2. Step 2: Convert to fraction form
    520,643.20/779,236.80 = 378,083.20/x
  3. Step 3: Cross multiply
    520,643.20x = 779,236.80 × 378,083.20
  4. Step 4: Simplify right side
    520,643.20x = 294,616,342,901.76
  5. Step 5: Solve for x
    x = 294,616,342,901.76/520,643.20
  6. Step 6: Final answer
    x = 565,869.95

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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.