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Finding the Fourth Proportional to 509, 702.50 and 312.63

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Solution

The fourth proportional to 509, 702.50 and 312.63 is: 431.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    509 : 702.50 = 312.63 : x
  2. Step 2: Convert to fraction form
    509/702.50 = 312.63/x
  3. Step 3: Cross multiply
    509x = 702.50 × 312.63
  4. Step 4: Simplify right side
    509x = 219,623.06
  5. Step 5: Solve for x
    x = 219,623.06/509
  6. Step 6: Final answer
    x = 431.48

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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.