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Finding the Fourth Proportional to 210,639.65, 315,928.33 and 77,488.77

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Solution

The fourth proportional to 210,639.65, 315,928.33 and 77,488.77 is: 116,221.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,639.65 : 315,928.33 = 77,488.77 : x
  2. Step 2: Convert to fraction form
    210,639.65/315,928.33 = 77,488.77/x
  3. Step 3: Cross multiply
    210,639.65x = 315,928.33 × 77,488.77
  4. Step 4: Simplify right side
    210,639.65x = 24,480,896,716.31
  5. Step 5: Solve for x
    x = 24,480,896,716.31/210,639.65
  6. Step 6: Final answer
    x = 116,221.69

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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.