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Finding the Fourth Proportional to 975.64, 1,346.26 and 556.05

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Solution

The fourth proportional to 975.64, 1,346.26 and 556.05 is: 767.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.64 : 1,346.26 = 556.05 : x
  2. Step 2: Convert to fraction form
    975.64/1,346.26 = 556.05/x
  3. Step 3: Cross multiply
    975.64x = 1,346.26 × 556.05
  4. Step 4: Simplify right side
    975.64x = 748,587.87
  5. Step 5: Solve for x
    x = 748,587.87/975.64
  6. Step 6: Final answer
    x = 767.28

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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.