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Finding the Fourth Proportional to 912.40, 1,365.72 and 651.56

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Solution

The fourth proportional to 912.40, 1,365.72 and 651.56 is: 975.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.40 : 1,365.72 = 651.56 : x
  2. Step 2: Convert to fraction form
    912.40/1,365.72 = 651.56/x
  3. Step 3: Cross multiply
    912.40x = 1,365.72 × 651.56
  4. Step 4: Simplify right side
    912.40x = 889,848.52
  5. Step 5: Solve for x
    x = 889,848.52/912.40
  6. Step 6: Final answer
    x = 975.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.