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Finding the Fourth Proportional to 702.19, 1,053.69 and 485.31

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Solution

The fourth proportional to 702.19, 1,053.69 and 485.31 is: 728.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.19 : 1,053.69 = 485.31 : x
  2. Step 2: Convert to fraction form
    702.19/1,053.69 = 485.31/x
  3. Step 3: Cross multiply
    702.19x = 1,053.69 × 485.31
  4. Step 4: Simplify right side
    702.19x = 511,366.29
  5. Step 5: Solve for x
    x = 511,366.29/702.19
  6. Step 6: Final answer
    x = 728.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.