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Finding the Fourth Proportional to 688.55, 1,031.47 and 413.83

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Solution

The fourth proportional to 688.55, 1,031.47 and 413.83 is: 619.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.55 : 1,031.47 = 413.83 : x
  2. Step 2: Convert to fraction form
    688.55/1,031.47 = 413.83/x
  3. Step 3: Cross multiply
    688.55x = 1,031.47 × 413.83
  4. Step 4: Simplify right side
    688.55x = 426,853.23
  5. Step 5: Solve for x
    x = 426,853.23/688.55
  6. Step 6: Final answer
    x = 619.93

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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.