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Finding the Fourth Proportional to 869.60, 1,305.16 and 407.77

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Solution

The fourth proportional to 869.60, 1,305.16 and 407.77 is: 612.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.60 : 1,305.16 = 407.77 : x
  2. Step 2: Convert to fraction form
    869.60/1,305.16 = 407.77/x
  3. Step 3: Cross multiply
    869.60x = 1,305.16 × 407.77
  4. Step 4: Simplify right side
    869.60x = 532,200.81
  5. Step 5: Solve for x
    x = 532,200.81/869.60
  6. Step 6: Final answer
    x = 612.00

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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.