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Finding the Fourth Proportional to 518,311.55, 715,328.04 and 288,889.79

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Solution

The fourth proportional to 518,311.55, 715,328.04 and 288,889.79 is: 398,700.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,311.55 : 715,328.04 = 288,889.79 : x
  2. Step 2: Convert to fraction form
    518,311.55/715,328.04 = 288,889.79/x
  3. Step 3: Cross multiply
    518,311.55x = 715,328.04 × 288,889.79
  4. Step 4: Simplify right side
    518,311.55x = 206,650,962,235.62
  5. Step 5: Solve for x
    x = 206,650,962,235.62/518,311.55
  6. Step 6: Final answer
    x = 398,700.28

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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.