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Finding the Fourth Proportional to 914.48, 1,261.60 and 619.28

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Solution

The fourth proportional to 914.48, 1,261.60 and 619.28 is: 854.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.48 : 1,261.60 = 619.28 : x
  2. Step 2: Convert to fraction form
    914.48/1,261.60 = 619.28/x
  3. Step 3: Cross multiply
    914.48x = 1,261.60 × 619.28
  4. Step 4: Simplify right side
    914.48x = 781,283.65
  5. Step 5: Solve for x
    x = 781,283.65/914.48
  6. Step 6: Final answer
    x = 854.35

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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.