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Finding the Fourth Proportional to 1,724, 2,379.16 and 977.84

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Solution

The fourth proportional to 1,724, 2,379.16 and 977.84 is: 1,349.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,724 : 2,379.16 = 977.84 : x
  2. Step 2: Convert to fraction form
    1,724/2,379.16 = 977.84/x
  3. Step 3: Cross multiply
    1,724x = 2,379.16 × 977.84
  4. Step 4: Simplify right side
    1,724x = 2,326,437.81
  5. Step 5: Solve for x
    x = 2,326,437.81/1,724
  6. Step 6: Final answer
    x = 1,349.44

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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.