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Finding the Fourth Proportional to 287,807.60, 431,711.40 and 90,815.60

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Solution

The fourth proportional to 287,807.60, 431,711.40 and 90,815.60 is: 136,223.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,807.60 : 431,711.40 = 90,815.60 : x
  2. Step 2: Convert to fraction form
    287,807.60/431,711.40 = 90,815.60/x
  3. Step 3: Cross multiply
    287,807.60x = 431,711.40 × 90,815.60
  4. Step 4: Simplify right side
    287,807.60x = 39,206,129,817.84
  5. Step 5: Solve for x
    x = 39,206,129,817.84/287,807.60
  6. Step 6: Final answer
    x = 136,223.40

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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.