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Finding the Fourth Proportional to 920.93, 1,378.95 and 555.21

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Solution

The fourth proportional to 920.93, 1,378.95 and 555.21 is: 831.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.93 : 1,378.95 = 555.21 : x
  2. Step 2: Convert to fraction form
    920.93/1,378.95 = 555.21/x
  3. Step 3: Cross multiply
    920.93x = 1,378.95 × 555.21
  4. Step 4: Simplify right side
    920.93x = 765,606.83
  5. Step 5: Solve for x
    x = 765,606.83/920.93
  6. Step 6: Final answer
    x = 831.35

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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.