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Finding the Fourth Proportional to 508.90, 702.70 and 312.46

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Solution

The fourth proportional to 508.90, 702.70 and 312.46 is: 431.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    508.90 : 702.70 = 312.46 : x
  2. Step 2: Convert to fraction form
    508.90/702.70 = 312.46/x
  3. Step 3: Cross multiply
    508.90x = 702.70 × 312.46
  4. Step 4: Simplify right side
    508.90x = 219,565.64
  5. Step 5: Solve for x
    x = 219,565.64/508.90
  6. Step 6: Final answer
    x = 431.45

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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.