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Finding the Fourth Proportional to 520,285.20, 779,909.40 and 239,312.40

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Solution

The fourth proportional to 520,285.20, 779,909.40 and 239,312.40 is: 358,730.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,285.20 : 779,909.40 = 239,312.40 : x
  2. Step 2: Convert to fraction form
    520,285.20/779,909.40 = 239,312.40/x
  3. Step 3: Cross multiply
    520,285.20x = 779,909.40 × 239,312.40
  4. Step 4: Simplify right side
    520,285.20x = 186,641,990,296.56
  5. Step 5: Solve for x
    x = 186,641,990,296.56/520,285.20
  6. Step 6: Final answer
    x = 358,730.15

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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.