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Finding the Fourth Proportional to 702.80, 1,055.26 and 609.28

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Solution

The fourth proportional to 702.80, 1,055.26 and 609.28 is: 914.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.80 : 1,055.26 = 609.28 : x
  2. Step 2: Convert to fraction form
    702.80/1,055.26 = 609.28/x
  3. Step 3: Cross multiply
    702.80x = 1,055.26 × 609.28
  4. Step 4: Simplify right side
    702.80x = 642,948.81
  5. Step 5: Solve for x
    x = 642,948.81/702.80
  6. Step 6: Final answer
    x = 914.84

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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.