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Finding the Fourth Proportional to 518,810.55, 715,849.70 and 314,968.79

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Solution

The fourth proportional to 518,810.55, 715,849.70 and 314,968.79 is: 434,590.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,810.55 : 715,849.70 = 314,968.79 : x
  2. Step 2: Convert to fraction form
    518,810.55/715,849.70 = 314,968.79/x
  3. Step 3: Cross multiply
    518,810.55x = 715,849.70 × 314,968.79
  4. Step 4: Simplify right side
    518,810.55x = 225,470,308,676.77
  5. Step 5: Solve for x
    x = 225,470,308,676.77/518,810.55
  6. Step 6: Final answer
    x = 434,590.83

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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.