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Finding the Fourth Proportional to 900.78, 1,243.28 and 585.50

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Solution

The fourth proportional to 900.78, 1,243.28 and 585.50 is: 808.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.78 : 1,243.28 = 585.50 : x
  2. Step 2: Convert to fraction form
    900.78/1,243.28 = 585.50/x
  3. Step 3: Cross multiply
    900.78x = 1,243.28 × 585.50
  4. Step 4: Simplify right side
    900.78x = 727,938.15
  5. Step 5: Solve for x
    x = 727,938.15/900.78
  6. Step 6: Final answer
    x = 808.12

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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.