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Finding the Fourth Proportional to 1,239.81, 1,710.45 and 715.74

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Solution

The fourth proportional to 1,239.81, 1,710.45 and 715.74 is: 987.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.81 : 1,710.45 = 715.74 : x
  2. Step 2: Convert to fraction form
    1,239.81/1,710.45 = 715.74/x
  3. Step 3: Cross multiply
    1,239.81x = 1,710.45 × 715.74
  4. Step 4: Simplify right side
    1,239.81x = 1,224,237.48
  5. Step 5: Solve for x
    x = 1,224,237.48/1,239.81
  6. Step 6: Final answer
    x = 987.44

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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.