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Finding the Fourth Proportional to 287,999.60, 431,999.40 and 260,443.40

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Solution

The fourth proportional to 287,999.60, 431,999.40 and 260,443.40 is: 390,665.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,999.60 : 431,999.40 = 260,443.40 : x
  2. Step 2: Convert to fraction form
    287,999.60/431,999.40 = 260,443.40/x
  3. Step 3: Cross multiply
    287,999.60x = 431,999.40 × 260,443.40
  4. Step 4: Simplify right side
    287,999.60x = 112,511,392,533.96
  5. Step 5: Solve for x
    x = 112,511,392,533.96/287,999.60
  6. Step 6: Final answer
    x = 390,665.10

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1.5x scale

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.