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Finding the Fourth Proportional to 78,323.65, 117,485.35 and 28,403.65

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Solution

The fourth proportional to 78,323.65, 117,485.35 and 28,403.65 is: 42,605.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,323.65 : 117,485.35 = 28,403.65 : x
  2. Step 2: Convert to fraction form
    78,323.65/117,485.35 = 28,403.65/x
  3. Step 3: Cross multiply
    78,323.65x = 117,485.35 × 28,403.65
  4. Step 4: Simplify right side
    78,323.65x = 3,337,012,761.53
  5. Step 5: Solve for x
    x = 3,337,012,761.53/78,323.65
  6. Step 6: Final answer
    x = 42,605.43

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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.