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Finding the Fourth Proportional to 904.55, 1,356.05 and 861.49

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Solution

The fourth proportional to 904.55, 1,356.05 and 861.49 is: 1,291.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.55 : 1,356.05 = 861.49 : x
  2. Step 2: Convert to fraction form
    904.55/1,356.05 = 861.49/x
  3. Step 3: Cross multiply
    904.55x = 1,356.05 × 861.49
  4. Step 4: Simplify right side
    904.55x = 1,168,223.51
  5. Step 5: Solve for x
    x = 1,168,223.51/904.55
  6. Step 6: Final answer
    x = 1,291.50

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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.