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Finding the Fourth Proportional to 1,316.98, 1,817.40 and 719.45

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Solution

The fourth proportional to 1,316.98, 1,817.40 and 719.45 is: 992.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.98 : 1,817.40 = 719.45 : x
  2. Step 2: Convert to fraction form
    1,316.98/1,817.40 = 719.45/x
  3. Step 3: Cross multiply
    1,316.98x = 1,817.40 × 719.45
  4. Step 4: Simplify right side
    1,316.98x = 1,307,528.43
  5. Step 5: Solve for x
    x = 1,307,528.43/1,316.98
  6. Step 6: Final answer
    x = 992.82

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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.