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Finding the Fourth Proportional to 900.65, 1,242.11 and 585.79

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Solution

The fourth proportional to 900.65, 1,242.11 and 585.79 is: 807.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.65 : 1,242.11 = 585.79 : x
  2. Step 2: Convert to fraction form
    900.65/1,242.11 = 585.79/x
  3. Step 3: Cross multiply
    900.65x = 1,242.11 × 585.79
  4. Step 4: Simplify right side
    900.65x = 727,622.92
  5. Step 5: Solve for x
    x = 727,622.92/900.65
  6. Step 6: Final answer
    x = 807.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.