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Finding the Fourth Proportional to 287,491.65, 431,320.68 and 118,980.87

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Solution

The fourth proportional to 287,491.65, 431,320.68 and 118,980.87 is: 178,505.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,491.65 : 431,320.68 = 118,980.87 : x
  2. Step 2: Convert to fraction form
    287,491.65/431,320.68 = 118,980.87/x
  3. Step 3: Cross multiply
    287,491.65x = 431,320.68 × 118,980.87
  4. Step 4: Simplify right side
    287,491.65x = 51,318,909,755.39
  5. Step 5: Solve for x
    x = 51,318,909,755.39/287,491.65
  6. Step 6: Final answer
    x = 178,505.74

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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.