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Finding the Fourth Proportional to 901.12, 1,243.60 and 502.80

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Solution

The fourth proportional to 901.12, 1,243.60 and 502.80 is: 693.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.12 : 1,243.60 = 502.80 : x
  2. Step 2: Convert to fraction form
    901.12/1,243.60 = 502.80/x
  3. Step 3: Cross multiply
    901.12x = 1,243.60 × 502.80
  4. Step 4: Simplify right side
    901.12x = 625,282.08
  5. Step 5: Solve for x
    x = 625,282.08/901.12
  6. Step 6: Final answer
    x = 693.89

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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.