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Finding the Fourth Proportional to 975.24, 1,346.93 and 645.13

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Solution

The fourth proportional to 975.24, 1,346.93 and 645.13 is: 891.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.24 : 1,346.93 = 645.13 : x
  2. Step 2: Convert to fraction form
    975.24/1,346.93 = 645.13/x
  3. Step 3: Cross multiply
    975.24x = 1,346.93 × 645.13
  4. Step 4: Simplify right side
    975.24x = 868,944.95
  5. Step 5: Solve for x
    x = 868,944.95/975.24
  6. Step 6: Final answer
    x = 891.01

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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.