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Finding the Fourth Proportional to 520,056.90, 780,085.35 and 319,727.70

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Solution

The fourth proportional to 520,056.90, 780,085.35 and 319,727.70 is: 479,591.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,056.90 : 780,085.35 = 319,727.70 : x
  2. Step 2: Convert to fraction form
    520,056.90/780,085.35 = 319,727.70/x
  3. Step 3: Cross multiply
    520,056.90x = 780,085.35 × 319,727.70
  4. Step 4: Simplify right side
    520,056.90x = 249,414,894,759.20
  5. Step 5: Solve for x
    x = 249,414,894,759.20/520,056.90
  6. Step 6: Final answer
    x = 479,591.55

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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.