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Finding the Fourth Proportional to 920.86, 1,381.30 and 707.02

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Solution

The fourth proportional to 920.86, 1,381.30 and 707.02 is: 1,060.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.86 : 1,381.30 = 707.02 : x
  2. Step 2: Convert to fraction form
    920.86/1,381.30 = 707.02/x
  3. Step 3: Cross multiply
    920.86x = 1,381.30 × 707.02
  4. Step 4: Simplify right side
    920.86x = 976,606.73
  5. Step 5: Solve for x
    x = 976,606.73/920.86
  6. Step 6: Final answer
    x = 1,060.54

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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.