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Finding the Fourth Proportional to 904.32, 1,356.48 and 858.15

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Solution

The fourth proportional to 904.32, 1,356.48 and 858.15 is: 1,287.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.32 : 1,356.48 = 858.15 : x
  2. Step 2: Convert to fraction form
    904.32/1,356.48 = 858.15/x
  3. Step 3: Cross multiply
    904.32x = 1,356.48 × 858.15
  4. Step 4: Simplify right side
    904.32x = 1,164,057.78
  5. Step 5: Solve for x
    x = 1,164,057.78/904.32
  6. Step 6: Final answer
    x = 1,287.22

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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.