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Finding the Fourth Proportional to 964.65, 1,445.13 and 920.91

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Solution

The fourth proportional to 964.65, 1,445.13 and 920.91 is: 1,379.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.65 : 1,445.13 = 920.91 : x
  2. Step 2: Convert to fraction form
    964.65/1,445.13 = 920.91/x
  3. Step 3: Cross multiply
    964.65x = 1,445.13 × 920.91
  4. Step 4: Simplify right side
    964.65x = 1,330,834.67
  5. Step 5: Solve for x
    x = 1,330,834.67/964.65
  6. Step 6: Final answer
    x = 1,379.60

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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.