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Finding the Fourth Proportional to 638,178.40, 956,392.80 and 520,080.40

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Solution

The fourth proportional to 638,178.40, 956,392.80 and 520,080.40 is: 779,407.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,178.40 : 956,392.80 = 520,080.40 : x
  2. Step 2: Convert to fraction form
    638,178.40/956,392.80 = 520,080.40/x
  3. Step 3: Cross multiply
    638,178.40x = 956,392.80 × 520,080.40
  4. Step 4: Simplify right side
    638,178.40x = 497,401,149,981.12
  5. Step 5: Solve for x
    x = 497,401,149,981.12/638,178.40
  6. Step 6: Final answer
    x = 779,407.69

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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.