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Finding the Fourth Proportional to 663.91, 915.31 and 570.25

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Solution

The fourth proportional to 663.91, 915.31 and 570.25 is: 786.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.91 : 915.31 = 570.25 : x
  2. Step 2: Convert to fraction form
    663.91/915.31 = 570.25/x
  3. Step 3: Cross multiply
    663.91x = 915.31 × 570.25
  4. Step 4: Simplify right side
    663.91x = 521,955.53
  5. Step 5: Solve for x
    x = 521,955.53/663.91
  6. Step 6: Final answer
    x = 786.18

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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.