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Finding the Fourth Proportional to 975.44, 1,345.94 and 555.80

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Solution

The fourth proportional to 975.44, 1,345.94 and 555.80 is: 766.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.44 : 1,345.94 = 555.80 : x
  2. Step 2: Convert to fraction form
    975.44/1,345.94 = 555.80/x
  3. Step 3: Cross multiply
    975.44x = 1,345.94 × 555.80
  4. Step 4: Simplify right side
    975.44x = 748,069.15
  5. Step 5: Solve for x
    x = 748,069.15/975.44
  6. Step 6: Final answer
    x = 766.91

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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.