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Finding the Fourth Proportional to 904.19, 1,247.78 and 511.23

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Solution

The fourth proportional to 904.19, 1,247.78 and 511.23 is: 705.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.19 : 1,247.78 = 511.23 : x
  2. Step 2: Convert to fraction form
    904.19/1,247.78 = 511.23/x
  3. Step 3: Cross multiply
    904.19x = 1,247.78 × 511.23
  4. Step 4: Simplify right side
    904.19x = 637,902.57
  5. Step 5: Solve for x
    x = 637,902.57/904.19
  6. Step 6: Final answer
    x = 705.50

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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.