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Finding the Fourth Proportional to 904.32, 1,358.72 and 751.36

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Solution

The fourth proportional to 904.32, 1,358.72 and 751.36 is: 1,128.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.32 : 1,358.72 = 751.36 : x
  2. Step 2: Convert to fraction form
    904.32/1,358.72 = 751.36/x
  3. Step 3: Cross multiply
    904.32x = 1,358.72 × 751.36
  4. Step 4: Simplify right side
    904.32x = 1,020,887.86
  5. Step 5: Solve for x
    x = 1,020,887.86/904.32
  6. Step 6: Final answer
    x = 1,128.90

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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.