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Finding the Fourth Proportional to 902.15, 1,244.95 and 509.30

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Solution

The fourth proportional to 902.15, 1,244.95 and 509.30 is: 702.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.15 : 1,244.95 = 509.30 : x
  2. Step 2: Convert to fraction form
    902.15/1,244.95 = 509.30/x
  3. Step 3: Cross multiply
    902.15x = 1,244.95 × 509.30
  4. Step 4: Simplify right side
    902.15x = 634,044.26
  5. Step 5: Solve for x
    x = 634,044.26/902.15
  6. Step 6: Final answer
    x = 702.82

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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.