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Finding the Fourth Proportional to 912.42, 1,365.72 and 651.60

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Solution

The fourth proportional to 912.42, 1,365.72 and 651.60 is: 975.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.42 : 1,365.72 = 651.60 : x
  2. Step 2: Convert to fraction form
    912.42/1,365.72 = 651.60/x
  3. Step 3: Cross multiply
    912.42x = 1,365.72 × 651.60
  4. Step 4: Simplify right side
    912.42x = 889,903.15
  5. Step 5: Solve for x
    x = 889,903.15/912.42
  6. Step 6: Final answer
    x = 975.32

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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.