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Finding the Fourth Proportional to 78,417.99, 117,626.99 and 28,488.78

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Solution

The fourth proportional to 78,417.99, 117,626.99 and 28,488.78 is: 42,733.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,417.99 : 117,626.99 = 28,488.78 : x
  2. Step 2: Convert to fraction form
    78,417.99/117,626.99 = 28,488.78/x
  3. Step 3: Cross multiply
    78,417.99x = 117,626.99 × 28,488.78
  4. Step 4: Simplify right side
    78,417.99x = 3,351,049,297.73
  5. Step 5: Solve for x
    x = 3,351,049,297.73/78,417.99
  6. Step 6: Final answer
    x = 42,733.17

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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.