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Finding the Fourth Proportional to 287,210.40, 430,815.60 and 161,239.20

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Solution

The fourth proportional to 287,210.40, 430,815.60 and 161,239.20 is: 241,858.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,210.40 : 430,815.60 = 161,239.20 : x
  2. Step 2: Convert to fraction form
    287,210.40/430,815.60 = 161,239.20/x
  3. Step 3: Cross multiply
    287,210.40x = 430,815.60 × 161,239.20
  4. Step 4: Simplify right side
    287,210.40x = 69,464,362,691.52
  5. Step 5: Solve for x
    x = 69,464,362,691.52/287,210.40
  6. Step 6: Final answer
    x = 241,858.80

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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.