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Finding the Fourth Proportional to 520,031.70, 780,047.55 and 485,039.70

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Solution

The fourth proportional to 520,031.70, 780,047.55 and 485,039.70 is: 727,559.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,031.70 : 780,047.55 = 485,039.70 : x
  2. Step 2: Convert to fraction form
    520,031.70/780,047.55 = 485,039.70/x
  3. Step 3: Cross multiply
    520,031.70x = 780,047.55 × 485,039.70
  4. Step 4: Simplify right side
    520,031.70x = 378,354,029,637.74
  5. Step 5: Solve for x
    x = 378,354,029,637.74/520,031.70
  6. Step 6: Final answer
    x = 727,559.55

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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.