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Finding the Fourth Proportional to 1,007.89, 1,390.97 and 559.80

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Solution

The fourth proportional to 1,007.89, 1,390.97 and 559.80 is: 772.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.89 : 1,390.97 = 559.80 : x
  2. Step 2: Convert to fraction form
    1,007.89/1,390.97 = 559.80/x
  3. Step 3: Cross multiply
    1,007.89x = 1,390.97 × 559.80
  4. Step 4: Simplify right side
    1,007.89x = 778,666.41
  5. Step 5: Solve for x
    x = 778,666.41/1,007.89
  6. Step 6: Final answer
    x = 772.57

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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.