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Finding the Fourth Proportional to 719.40, 990.48 and 608.64

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Solution

The fourth proportional to 719.40, 990.48 and 608.64 is: 837.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.40 : 990.48 = 608.64 : x
  2. Step 2: Convert to fraction form
    719.40/990.48 = 608.64/x
  3. Step 3: Cross multiply
    719.40x = 990.48 × 608.64
  4. Step 4: Simplify right side
    719.40x = 602,845.75
  5. Step 5: Solve for x
    x = 602,845.75/719.40
  6. Step 6: Final answer
    x = 837.98

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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.