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Finding the Fourth Proportional to 287,359.60, 431,039.40 and 74,127.10

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Solution

The fourth proportional to 287,359.60, 431,039.40 and 74,127.10 is: 111,190.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,359.60 : 431,039.40 = 74,127.10 : x
  2. Step 2: Convert to fraction form
    287,359.60/431,039.40 = 74,127.10/x
  3. Step 3: Cross multiply
    287,359.60x = 431,039.40 × 74,127.10
  4. Step 4: Simplify right side
    287,359.60x = 31,951,700,707.74
  5. Step 5: Solve for x
    x = 31,951,700,707.74/287,359.60
  6. Step 6: Final answer
    x = 111,190.65

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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.