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Finding the Fourth Proportional to 287,569.10, 431,353.65 and 74,336.60

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Solution

The fourth proportional to 287,569.10, 431,353.65 and 74,336.60 is: 111,504.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,569.10 : 431,353.65 = 74,336.60 : x
  2. Step 2: Convert to fraction form
    287,569.10/431,353.65 = 74,336.60/x
  3. Step 3: Cross multiply
    287,569.10x = 431,353.65 × 74,336.60
  4. Step 4: Simplify right side
    287,569.10x = 32,065,363,738.59
  5. Step 5: Solve for x
    x = 32,065,363,738.59/287,569.10
  6. Step 6: Final answer
    x = 111,504.90

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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.