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Finding the Fourth Proportional to 520,278.76, 717,970.02 and 305,415.40

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Solution

The fourth proportional to 520,278.76, 717,970.02 and 305,415.40 is: 421,464.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,278.76 : 717,970.02 = 305,415.40 : x
  2. Step 2: Convert to fraction form
    520,278.76/717,970.02 = 305,415.40/x
  3. Step 3: Cross multiply
    520,278.76x = 717,970.02 × 305,415.40
  4. Step 4: Simplify right side
    520,278.76x = 219,279,100,846.31
  5. Step 5: Solve for x
    x = 219,279,100,846.31/520,278.76
  6. Step 6: Final answer
    x = 421,464.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.