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Finding the Fourth Proportional to 815,658.72, 1,223,707.86 and 342,216.96

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Solution

The fourth proportional to 815,658.72, 1,223,707.86 and 342,216.96 is: 513,417.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    815,658.72 : 1,223,707.86 = 342,216.96 : x
  2. Step 2: Convert to fraction form
    815,658.72/1,223,707.86 = 342,216.96/x
  3. Step 3: Cross multiply
    815,658.72x = 1,223,707.86 × 342,216.96
  4. Step 4: Simplify right side
    815,658.72x = 418,773,583,777.31
  5. Step 5: Solve for x
    x = 418,773,583,777.31/815,658.72
  6. Step 6: Final answer
    x = 513,417.65

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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.