Home / 287,622.20-431,433.30-77,281.40

Finding the Fourth Proportional to 287,622.20, 431,433.30 and 77,281.40

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Solution

The fourth proportional to 287,622.20, 431,433.30 and 77,281.40 is: 115,922.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,622.20 : 431,433.30 = 77,281.40 : x
  2. Step 2: Convert to fraction form
    287,622.20/431,433.30 = 77,281.40/x
  3. Step 3: Cross multiply
    287,622.20x = 431,433.30 × 77,281.40
  4. Step 4: Simplify right side
    287,622.20x = 33,341,769,430.62
  5. Step 5: Solve for x
    x = 33,341,769,430.62/287,622.20
  6. Step 6: Final answer
    x = 115,922.10

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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.